The secret to realistic lips lies in simple geometric shapes

Society · Published 14 October 2026 Swipe more like this →

In short: Capturing a lifelike smile is not about intricate detail, but about mastering basic construction. By viewing complex features like teeth and lips as simple squares and triangles, artists can avoid common pitfalls like the 'ghoulish' look and create much more convincing facial expressions.

To begin drawing a mouth from the front, start with a simple foundation. Use a curved line to establish the trajectory of a smile and an oval to define the overall lip shape. The top lip can be conceptualized as two triangles with a slight indentation at the top, while the bottom lip is often modeled as a square shape with sides that curve upward. Notably, the bottom lip is typically thicker than the top. When mapping the top lip, remember to include a small notch at its upper edge. This initial stage is all about establishing the basic structure before any fine lines are applied.

The mechanics of expression change the geometry of the mouth significantly. When a character smiles, the lips stretch sideways, causing the center to become thinner and the sides to pull straighter. Conversely, a neutral expression allows the lips to appear fuller. In a side profile, the top lip should be drawn slightly forward of the bottom lip, appearing more triangular, while the bottom lip takes on a more circular, fuller shape. A smile also causes the characteristic bump found in the center of the upper lip to flatten out. This transformation is key to capturing movement.

Detailing requires a delicate touch to maintain realism. When drawing teeth, treating them as a single white box or square helps establish the mouth's construction. Avoid the temptation to draw every individual tooth, as this can result in a ghoulish appearance; instead, use small nicks around the edges to suggest teeth and add subtle indications of gums. Finally, use shading lines not just to show light, but to define the physical shape and the subtle edge found at the bottom of the lips.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

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