30-Second Hands and Feet Scribbly Warm-Up Sketch for Animated Cartoons

Done as part of a practice session with poses of 30 seconds in length.

My current goal is: Improve my understanding of hand and foot bone structures.

As you can plainly examine, here is my latest scribble, which is fine with me, so that it helps me fairly loosen me up for drawing really faster. What do you think of my process??