How to use foreshortening reference to draw an arm pointing at you: why limbs come out too long, and the measuring, overlap and multi-angle fixes.
To draw an arm pointing at you, use foreshortening reference and measure instead of guessing. Compare the arm against a visible unit such as shoulder width, draw the overlaps where the hand covers the forearm, make the near end clearly larger than the far end, and check the result against a photo taken from that exact angle.
You draw the figure from the side and it works. Then the pose asks for an arm coming straight at the viewer, and the arm comes out too long, like a limb borrowed from a taller person. You shorten it, and now it reads as a stump. Somewhere between those two failures is the correct drawing, and you cannot find it by feel.
A foreshortened arm comes out too long because your brain keeps the arm’s remembered length even when your eye sees a short shape. Psychologists call this size constancy: we perceive an object as the same size even as its image on the retina changes. When drawing, that stored length quietly overrides what is actually in front of you.
When a forearm points directly at you, your eyes receive a small ellipse with a hand attached. Your brain receives the label “arm,” and that label comes with a length. The effect is described as size and perceptual constancy . It keeps a coffee cup the same size as you walk away from it, and it is why foreshortening errors run in one direction: almost nobody draws a foreshortened limb too short.
The fix is not “look harder.” The fix is a procedure that produces a measurement your brain cannot argue with.
Measure a foreshortened limb by comparison, not by inches. Pick one unit that is clearly visible and roughly flat to your line of sight, such as shoulder width or the upper arm, then ask whether the foreshortened part is longer or shorter than that unit. A ratio between two shapes is far harder to misjudge than a length.
The head is the traditional unit, but a foreshortened figure often hides it, so use whatever is visible: shoulder width, the upper arm you can see, chin to sternum. Hold up a pencil from life, or lay a straight edge on screen over photo reference. The first time, most people are surprised: the thigh that felt like “two heads” measures barely one.
Published 2026-07-24 on the Refimages blog.