So I'm working to improve my hand mastery in several ways. My daughter, Amanda, has been hand-modeling for me (below). I am watching Rob Liberace's dvd "Anatomy: The Arm and Hand" (it's pretty good). And I found a great book on the subject, "Drawing Dynamic Hands" by Burne Hogarth.
|Amanda's hands, 17x14", charcoal, 20-minute sketches from life|
If you draw or paint people, you should consider getting this book...unless you're already a hand master. Each page is loaded with well illustrated advice on how to infuse more gesture and energy into depictions of the hand. Hogarth published several other books on drawing which might also be worth a look.
Here are the table of contents and a few random pages from "Drawing Dynamic Hands":