Proportions Guide of the Human Skull & Anatomy Studies

If you've ever searched "skull proportions" on Google, there's a good chance you've already seen this work, because these illustrations have held the top spot in Google Image results for years, and were featured in a dedicated article on 80 Level, one of the leading publications for 3D artists and game developers.

This series represents years of independent anatomy study, built entirely out of a personal need: I wanted reference material that actually worked for drawing and sculpting portraits - clear, systematic, and built around how artists think rather than how medical textbooks are written.

Every illustration in this collection was created from scratch, grounded in measurement, and designed to be immediately usable at the desk or the sculpture stand.

This work sits at the intersection of scientific accuracy and practical artistic application — the kind of reference that doesn't just teach you what the skull looks like, but how to think about it when building a portrait from nothing.

📖Read the full feature on 80 Level: https://80.lv/articles/a-short-guide-on-human-skull-proportion

human skull showing units and divisions based on maximum cranial breadth and height, with fractional measurements marked in orange for artist proportion reference
Human skull proportion guide showing the cranial and facial halves divided by the eye line, alongside a three-thirds vertical breakdown into forehead, eye socket and cheekbone, and lower jaw regions
Front view comparison of the human skull for artists showing the detailed organic surface form alongside a clean geometric planar model, illustrating the primary structural planes for portrait drawing
Three-quarter view comparison of the human skull for artists showing the organic form alongside a simplified planar model to illustrate primary planes for portrait drawing and sculpting
Six-view reference sheet of the human skull planes for artists, showing front, three-quarter, and side views in both organic and planar forms for use in portrait drawing and head sculpting
Annotated front and side view of the human skull measuring total skull length, cranial length, maximum cranial breadth, minimum frontal breadth, bizygomatic breadth, and bigonial breadth for artist proportion studies
Four-panel side view reference of the human skull showing maximum cranial length, total skull length, cranial height, and vertical proportion divisions including halves and thirds for portrait artists and sculptors
Three-quarter view illustration pairing a simplified box head model with the human skull, showing key construction landmarks including hairline, brow line, eye line, base of nose, lips, and bottom of jaw
Side view illustration of the human skull building blocks concept showing the organic skull alongside a simplified geometric form with sphere and box components to identify the skull midpoint for artists
Colour-coded skull building blocks illustration showing the cranium in pink, cheekbone and nasal cavity area in blue, maxilla and teeth in yellow, and mandible in green, with a matching simplified geometric model

What this series covers:

  • Planes of the human skull — organic form compared directly to planar breakdowns across front, three-quarter, and side views, so you can see exactly how light and shadow will behave across any angle

  • Units and divisions — the skull mapped using maximum cranial breadth and height as base units, giving you a proportional system that scales to any head size

  • Midpoint and thirds — how the skull divides into its cranial and facial halves at the eye line, and how the face further splits into three vertical thirds from forehead to jaw

  • Primary shapes and proportions — the underlying sphere and oval geometry that defines the skull's silhouette from the front and side, the foundation of every solid portrait construction method

  • Cranial breadth, length, and total skull measurements — bizygomatic and bigonial breadth, frontal breadth, cranial length, and total skull length, annotated and measurable

  • Skull building blocks — a colour-coded breakdown of the skull into its four primary masses (cranium, cheekbone and nasal cavity, maxilla, and mandible), paired with simplified geometric equivalents for direct application in drawing and sculpting

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Main Shapes & Muscles of the Neck