Build the head from a ball and a plane
Started every head as a sphere with flattened sides, hung the brow, nose, and chin thirds off it, and turned the whole construction in space before any feature was drawn.
Why it matters · A feature drawn on a constructed ball sits on a skull; a feature drawn on a flat oval floats. The ball-and-plane head is the reason a Loomis-trained artist can draw a convincing head from any angle without a reference, and it remains the most-taught head method in the world.
Andrew Loomis, Drawing the Head and Hands (Viking), 1956
Render everything under the form principle
Held that a picture convinces when every form is rendered consistently with one light source, one set of value relationships, and one atmosphere, what he called the form principle.
Why it matters · It moves the question from "does this detail look right" to "does this detail obey the same light as everything else." One consistent light is why a Loomis illustration reads as a single moment instead of assembled parts, and it is the idea that connects drawing to painting.
Andrew Loomis, Creative Illustration (Viking), Part 1, the form principle, 1947
Set the figure with head-unit proportions
Measured the standing figure in head lengths, using an idealised eight-head chart as scaffolding, then adjusted for the individual model or character.
Why it matters · A memorised proportional scaffold means the figure starts believable before observation refines it. The chart is a starting grid, not a rule; Loomis is explicit that the ideal figure is a convention you deviate from on purpose.
Andrew Loomis, Figure Drawing for All It's Worth (Viking), 1943
Group values into a few big masses
Reduced every subject to a small number of connected value shapes, keeping the big tonal statement simple and saving small value changes for inside the masses.
Why it matters · Pictures carry across a room on three or four values, not forty. Grouping first is what keeps finish from destroying unity, the same discipline the tonal painters practiced, stated as a teachable rule.
Andrew Loomis, Creative Illustration (Viking), the tonal chapters, 1947
Compose by informal subdivision
Divided the picture rectangle with unequal, informal divisions to place subjects, rather than centring or halving, so the design felt inevitable without reading as geometric.
Why it matters · It is a practical, repeatable answer to "where do I put things," fast enough for deadline work and loose enough to avoid the deadness of symmetrical layouts. Working illustrators still use it because it decides composition in minutes.
Andrew Loomis, Creative Illustration (Viking), the composition chapters, 1947