30-Second Hand Loose Scribble Warm-up Sketch

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. Here is my latest scribbly and loose warm-up sketch of a hand. As you can plainly look, my touch is my lightest. What do you think. Polyvios Animations. P.S. I'm still working on getting the inner feelings of the hand and foot bone structures.