Pen Cat Drawing: Contour, Line Weight, and Hatching

Object Drawing Lessons

This lesson teaches a pen-and-ink cat drawing built on three controllable skills: contour, line weight, and hatching. You will use a simple cat outline as a scaffold, then practice varying line thickness and adding directional hatching to suggest form. The convention for line weight is explicit: thin lines are drawn with light pressure and a single pass; thick lines use firmer pressure or a second pass over the same path. Hatching direction follows a stated rule: hatch lines run parallel to the form's curve or at a consistent angle across a flat area. Letter styles and handwriting vary, so the rubric rewards deliberate, consistent choices rather than one universal look. All measurements are hypothetical examples; measure your own pen and paper before relying on any number.

Practice materials: Printable downloads are not available for this lesson yet. Use the instructions and four exercises below.

Reference illustration

Use the stated measurements and conventions for each exercise.

Contour Control: Building a Clean Cat Outline

Contour is the boundary line of a shape. For a pen cat, start with a simple seated profile: a rounded head, two triangular ears, a curved back, a tail curling to one side, and four short legs. Keep the first pass light so you can adjust before committing to darker ink.

Use a single continuous line where possible. If you must lift the pen, restart exactly at the end point of the previous line. Gaps and double lines are the most common contour errors. A clean contour reads as confidence even when the shape is simple.

Define your line-weight convention before drawing: thin lines are one light pass; thick lines are one firm pass or two light passes. Do not mix conventions mid-drawing. This makes the result checkable.

1. Draw a light oval for the head, about 3 cm wide (hypothetical example; measure your own space).
2. Add two triangular ears on top, each about 1.5 cm tall.
3. Draw a curved back line from the base of the head to the tail base.
4. Add a tail curve that ends in a soft point.
5. Draw four short legs with rounded paws.
6. Check for gaps and double lines before adding weight.

Line Weight: Making the Cat Read Clearly

Line weight is the thickness of a line. In pen, you control it with pressure and repetition. A thin line suggests light, distance, or fine detail. A thick line suggests weight, shadow, or a strong edge. Use thick lines on the underside of the cat and around the paws; use thin lines on the top of the head and along the back.

A line-weight comparison strip helps you calibrate. Draw three short lines: one light single pass, one firm single pass, and one double pass. Label them thin, medium, and thick. Use these as your reference for the whole drawing.

Avoid changing weight randomly. Every thick line should have a reason: shadow, contact with the ground, or a major contour. This rule makes the drawing checkable and prevents muddy results.

1. Draw a comparison strip with three lines: thin, medium, thick.
2. Outline the cat with thin lines first.
3. Go over the underside of the body and the paws with medium or thick lines.
4. Keep the top of the head and the back thin.
5. Check that every thick line has a stated reason.

Hatching: Directional Lines for Form

Hatching is a set of parallel lines used to suggest shadow or texture. The direction rule for this lesson: hatch lines run parallel to the nearest curved contour, or at a consistent angle across a flat area. On the cat's back, hatch lines follow the curve of the spine. On the chest, they run vertically. On the tail, they follow the tail's curve.

Spacing controls darkness. Close spacing reads darker; wide spacing reads lighter. Keep spacing consistent within one area. Do not cross-hatch unless you state a second direction and a reason.

Hatching should not cover the entire cat. Leave the lit side open. A common mistake is hatching everywhere, which flattens the form. Choose one shadow side and hatch only there.

1. Choose a light source, for example from the upper left (hypothetical).
2. Mark the shadow side lightly with a few guide dots.
3. Hatch the shadow side with lines parallel to the nearest contour.
4. Keep spacing even within each area.
5. Leave the lit side unhatched or very lightly hatched.

Putting It Together: A Checkable Pen Cat

Combine contour, line weight, and hatching in one drawing. First draw the contour thin. Then thicken the underside and paws. Then hatch the shadow side. Finally, check the drawing against the rubric: clean contour, consistent weight convention, directional hatching, and a clear light side.

The worked example below shows a complete cat with a stated light source and a consistent convention. Use it as a model, not a template. Your cat can have a different pose, tail direction, or ear shape as long as the conventions are consistent.

1. Draw the contour thin.
2. Thicken the underside and paws.
3. Hatch the shadow side with directional lines.
4. Check against the rubric.
5. Adjust any line that breaks the convention.

Worked example

Draw a seated cat in pen with a light source from the upper left. Use thin lines on the top and back, thick lines on the underside and paws, and hatch the shadow side with lines parallel to the nearest contour. State your line-weight convention.

Four practice exercises

Common mistakes

• Hatching in random directions across the cat. State the direction rule before hatching: parallel to the nearest contour or a consistent angle. Check each area against the rule.
• Using thick lines everywhere, which makes the cat look heavy and muddy. Reserve thick lines for the underside, paws, and major contours. Keep the top and back thin.
• Leaving gaps or double lines in the contour. Restart exactly at the end point of the previous line. Check for gaps before adding weight.
• Hatching the entire cat, which flattens the form. Choose one shadow side and leave the lit side open. Hatch only where shadow is stated.

Self-check rubric

• Contour is clean with no unintended gaps or double lines.
• Line-weight convention is stated and followed consistently.
• Every thick line has a stated reason (shadow, contact, or major contour).
• Hatching direction follows the stated rule (parallel to nearest contour or consistent angle).
• Hatching spacing is even within each area.
• One shadow side is chosen and the lit side is left open or lightly hatched.
• The drawing is checkable against the stated conventions, allowing valid alternative poses and shapes.

Questions and answers