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Half-Face Mirror Symmetry Drawing: Complete the Missing Side
Learn to complete a half-drawn face by mirroring features across a vertical axis. Practice placement, proportion, and self-checking with a clear convention.
Free lesson
Four exercises
Worked answers
Object Drawing Lessons
Completing a half-face is a focused exercise in mirrored feature placement. You will use a vertical mirror axis to locate the missing eye, eyebrow, ear, and mouth corner by measuring equal distances from the axis. This lesson defines a simple convention for judging placement, offers a worked example, and provides four self-contained practice tasks. All measurements are hypothetical examples; measure your own paper and tools. The goal is consistent, checkable symmetry, not a single universal face style.
Practice materials: Printable downloads are not available for this lesson yet. Use the instructions and four exercises below.
Set the mirror axis and reference points
Draw a light vertical line down the center of your paper. This is the mirror axis. On the drawn half, mark three horizontal reference lines: top of head, eye midline, and chin. Measure their distances from the axis with a ruler and record them in millimeters. These become your mirror distances.
Choose a small set of anchor points on the drawn side: outer eye corner, inner eye corner, eyebrow peak, ear top, ear bottom, and mouth corner. For each, measure the horizontal distance from the axis and the vertical distance from a reference line. Write these pairs in a table. The missing side will use the same vertical positions and equal horizontal distances on the opposite side of the axis.
- Draw a vertical mirror axis and three horizontal reference lines.
- Measure and record horizontal distances from the axis for each anchor point.
- Measure and record vertical distances from the nearest reference line.
- Plot mirrored points on the blank side using equal horizontal distances.
- Connect points lightly and compare with the drawn side before darkening.
Mirror the eye, eyebrow, and ear
For the eye, mirror the outer and inner corners first. If the drawn outer corner is 18 mm from the axis, the missing outer corner is 18 mm on the other side at the same height. The inner corner follows the same rule. Draw a light oval between the mirrored corners, matching the drawn eye's height and tilt direction reversed.
The eyebrow uses the same anchor method: mirror its start, peak, and end. The ear is placed by mirroring its top and bottom vertical positions and its horizontal distance from the axis. Keep lines light until all anchors are plotted. A common error is mirroring the shape but not the position; check both distance and height.
- Plot mirrored outer and inner eye corners.
- Draw the eye oval between the mirrored corners.
- Mirror eyebrow start, peak, and end points.
- Mirror ear top and bottom positions.
- Check each point's distance from the axis with a ruler.
Complete the mouth and jaw line
Mirror the mouth corner by equal horizontal distance from the axis and the same vertical height. The center of the mouth lies on the axis, so the missing corner and the drawn corner should be equidistant from the center line. For the jaw, mirror two or three points along the jaw curve, then connect them with a light line that matches the drawn side's curvature.
Use a convention for judging symmetry: fold the paper along the axis if it is thin, or hold a mirror vertically on the axis. Valid alternatives are allowed because faces vary; the check is equal distance from the axis and matching vertical position, not identical line style. If a point is off by more than 2 mm in this hypothetical example, adjust it before finalizing.
- Mirror the mouth corner and mark the mouth center on the axis.
- Mirror two or three jaw curve points.
- Connect jaw points with a light line.
- Fold or mirror-check the paper along the axis.
- Adjust any point that is more than 2 mm off in this example.
Worked example
A half-face is drawn on the left of a vertical axis. The drawn outer eye corner is 20 mm left of the axis and 30 mm above the eye midline. The drawn inner eye corner is 8 mm left of the axis and 28 mm above the eye midline. Where do the mirrored outer and inner eye corners go on the right side?
Worked answer
The mirrored outer eye corner is 20 mm right of the axis and 30 mm above the eye midline. The mirrored inner eye corner is 8 mm right of the axis and 28 mm above the eye midline.
Four practice exercises
Exercise 1
A half-face is drawn on the left. The drawn eyebrow peak is 14 mm left of the axis and 12 mm above the eye midline. The drawn ear top is 22 mm left of the axis and 40 mm above the chin line. State the mirrored positions on the right side.
Show answer and check
Eyebrow peak: 14 mm right of the axis, 12 mm above the eye midline. Ear top: 22 mm right of the axis, 40 mm above the chin line.
Why: Mirroring keeps the same vertical distance from the reference line and uses an equal horizontal distance on the opposite side of the axis.
Check: Measure each mirrored point from the axis and from the same reference line; compare with the drawn side.
Exercise 2
A drawn mouth corner is 10 mm left of the axis and 5 mm below the eye midline. The mouth center is on the axis. Where is the missing mouth corner, and what is the horizontal distance between the two corners?
Show answer and check
The missing mouth corner is 10 mm right of the axis and 5 mm below the eye midline. The horizontal distance between the corners is 20 mm.
Why: The missing corner mirrors the drawn corner's distance and height. The total width is the sum of the two equal distances from the axis.
Check: Measure 10 mm right of the axis at the same height, then measure the full width across the axis; it should be 20 mm.
Exercise 3
A drawn jaw point is 16 mm left of the axis and 25 mm below the eye midline. A second drawn jaw point is 12 mm left of the axis and 35 mm below the eye midline. Plot the mirrored points and describe how you would check them with a fold.
Show answer and check
Mirrored points: 16 mm right at 25 mm below the eye midline, and 12 mm right at 35 mm below the eye midline. Fold along the axis; the drawn points and mirrored points should meet.
Why: Each point keeps its vertical distance and mirrors its horizontal distance. Folding tests both distance and height at once.
Check: Fold the paper along the axis and press lightly; the plotted points should align with the drawn points within the chosen tolerance.
Exercise 4
A drawn inner eye corner is 9 mm left of the axis and 27 mm above the eye midline. Your first attempt places the mirrored corner 11 mm right of the axis and 27 mm above the eye midline. Is this acceptable under the 2 mm example tolerance? If not, what should it be?
Show answer and check
Yes. The horizontal distance is off by exactly 2 mm, which is within the example tolerance of 2 mm, so it is acceptable. For a tighter result, move it to 9 mm right of the axis at the same height.
Why: The mirrored horizontal distance should equal the drawn distance. An 11 mm placement is 2 mm farther than the correct 9 mm, which is exactly at the example tolerance limit and therefore acceptable under the stated convention; moving it to 9 mm gives a tighter match.
Check: Measure from the axis to the drawn corner and to the mirrored corner; the two distances should match within your chosen tolerance.
Common mistakes
- Measuring from the edge of the paper instead of the mirror axis. Always measure horizontal distances from the vertical axis, not from the paper edge.
- Mirroring the shape but keeping the same tilt direction. Reverse the tilt: if the drawn eyebrow slopes up toward the axis, the missing one slopes up away from the axis by the same amount.
- Darkening lines before all anchor points are plotted. Plot all mirrored points lightly first, check distances, then darken.
- Assuming the face center is the paper center. Draw the axis where the drawn half's center line actually is, then measure from that line.
Self-check rubric
- Mirror axis is drawn and used as the measurement reference.
- At least four anchor points are measured and recorded.
- Mirrored points use equal horizontal distances from the axis.
- Vertical positions match the drawn side within the chosen tolerance.
- Lines are light until points are checked.
- A fold or mirror check is performed and adjustments are noted.
- Valid alternatives in line style and small shape differences are accepted.
Questions and answers
Do both sides have to look exactly the same?
No. The convention checks equal distance from the axis and matching vertical position. Line style and small shape differences are valid alternatives.
What if my drawn half is not perfectly centered on the paper?
Place the mirror axis on the drawn half's center line, not the paper center, and measure all distances from that axis.
How accurate should the measurements be?
Use a ruler and aim for within 2 mm in this hypothetical example. Measure your actual paper and tools to set your own tolerance.
Can I use a mirror instead of folding?
Yes. Hold a small mirror vertically on the axis. The reflected drawn side should align with your plotted points.