Portrait Mouth and Nose Construction

Core Idea

Noses and mouths are three-dimensional forms: the nose is essentially a pyramid; the mouth a cylinder with a center seam. Accurate construction under different angles requires understanding geometry. Subtle tone and shadow convey form more effectively than outline.

Explainer

From your work on basic facial proportions, you know where the nose and mouth sit on the head — the base of the nose at roughly the halfway point between the brow line and the chin, the mouth roughly one-third of the way from the nose to the chin. Now the challenge shifts from placement to construction: how to draw these features as convincing three-dimensional forms rather than flat symbols. The single most important mental shift is to stop thinking of the nose as two dots and a line, and the mouth as a curved slit. Both are complex volumes that catch light and cast shadow in specific, predictable ways.

The nose is best understood as a wedge or pyramid with four distinct planes: a top plane (the bridge) that catches direct light, two side planes that turn away into halfshadow, and a bottom plane (the underside) that is usually the darkest because it faces away from overhead light. At the tip, this pyramid transitions into rounded forms — the ball of the nose and the wings (alae) on either side. The key to drawing the nose convincingly is rendering these plane changes through value shifts rather than outline. Beginners tend to draw the contour of the nose with a dark line, but in reality the nose's edges are mostly soft transitions where one plane turns into another. The only consistently hard, dark shapes are the nostrils — and even these are not symmetrical holes but crescent-shaped openings whose visible shape changes dramatically with viewing angle.

The mouth sits on a curved cylindrical form — the dental mound created by the teeth and jawbone beneath the lips. This curvature means the corners of the mouth recede in space relative to the center, which is critical for avoiding the flat, pasted-on look that plagues beginner portraits. The upper lip typically has a distinct Cupid's bow shape with a central dip and two peaks, and because it faces slightly downward, it usually appears darker than the lower lip. The lower lip is a fuller, rounder form that faces upward and catches more light, often appearing as one of the brighter areas on the lower face. Between the lips, the lip seam is not a hard line but a shadow created by the meeting of two forms — it is darkest at the center and lightens toward the corners.

When constructing both features at different angles, your understanding of basic geometric forms becomes essential. As the head turns in three-quarter view, the nose's pyramid reveals more of one side plane and less of the other. The far nostril may become partially or fully hidden. The mouth's cylindrical form means the far corner compresses and recedes while the near corner remains fuller. In a looking-up view, the bottom plane of the nose becomes prominently visible while the bridge shortens due to foreshortening. Building these features on top of their geometric scaffolding — pyramid for nose, cylinder for mouth — and then refining with observed shadow shapes is far more reliable than attempting to copy surface appearances directly. The geometry gives you a predictable structure that holds up at any angle; observation then adds the individual character that makes a portrait look like a specific person.