Daily Sketch: Arm Proportions

I was messing around, constructing a new pose for a female in my Moleskine. I was having trouble remembering the arm proportions so I looked up some photographic images of a human skeleton.

Bringing some images into Photoshop and using the Measure tool I figured out that if you consider the length from the shoulder joint to the elbow as one generic unit, then the distance from the elbow to the wrist joint is 0.8 units. In turn, the distance from the wrist to the tip of the longest finger (if the fingers are extended) is roughly 0.6 units. That's a handy ratio to remember. 1 - 0.8 - 0.6. I should do the same for the legs.