The Interdimensional Traveler: A Full Body Character Design - ZBrush Creature Design: Creating Dynamic Concept Imagery for Film and Games - page 113

Figure 3-11: Mask the body to isolate it from the arms to facilitate lengthening them. Then lengthen the
arms using Transpose Move by Alt click dragging in the circle at the elbow.
7. This stretches the upper arm but not the lower, so it will not complete the effect we want. I want to give
the forearm a slightly longer proportion relative to the upper arm. To do this, mask to the elbow and use
Transpose again to stretch just the forearm. Click at the elbow and draw the line to the wrist. Then click
and drag the last circle to stretch the forearm ( Figure 3-12 ).
8. The final effect is seen in Figure 3-13 . Based on what we know about human proportions, we want
the fingertips to fall almost halfway down the thigh. If you make the arms look too short, it will give the
character a squat compact appearance, which is unappealing.