Lesson 6 · 2/4

Line Weight and Line Quality

Use thick and thin lines to show depth, light and importance.

10 min Beginner

A line can do much more than describe an edge. By changing its weight (thickness and darkness), a single line can suggest depth, light, texture and importance. Line weight is what makes line drawings look solid instead of flat.

Uniform vs. varied weight

The same box with uniform lines (left) and varied line weight (right). The light comes from the upper right.

A drawing made with lines of the same weight everywhere reads as a flat diagram. Varying the weight tells the viewer how the form sits in space.

Rules of thumb for line weight

Closer = thicker. Objects near the viewer get heavier lines; distant objects get lighter, thinner lines. This mimics atmospheric perspective.
Shadow side = thicker. Edges facing away from the light get heavier lines; edges facing the light get thin or broken lines.
Overlaps = thicker. Where one form passes in front of another, darken the line of the front form and lighten the one behind it. This creates instant depth.
Contact = darker. Where an object touches the ground or another object, add a small dark accent.
Outside heavier, inside lighter. The silhouette usually gets a heavier line than interior details like folds and textures.

Line quality

Line quality is the character of a line: smooth, broken, sharp, soft, shaky, flowing. Different subjects call for different qualities:

Smooth, tapered lines for skin, fabric and organic shapes.
Crisp, straight lines for architecture and machines.
Broken, scratchy lines for rough textures like bark, stone or fur.
Lost lines (lines that fade out or disappear) where light hits an edge strongly. They let the viewer's imagination complete the shape, which looks elegant.

How to vary weight

With a pencil: change the pressure, change the pencil (2H to 4B), or go over the line again. With ink: change pen size, or use a brush pen and vary pressure. Add weight in a second pass: draw everything light first, then decide where to emphasize.

Exercise 1

Box variations

Draw the same box three times. First with uniform lines. Then decide where the light comes from and apply varied line weight. Finally, draw a second box partly in front of the first and use overlap weight to separate them.

Exercise 2

Line quality sampler

Fill a page with small squares. In each, draw one line with a different quality: smooth, tapered, broken, shaky, jagged, flowing, dotted, lost. Then draw a simple object (a leaf, a rock, a cup) using the quality that fits best.

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