Why hands?  I find all hands interesting, from the hands of young children with nearly translucent skin, to hands which have a few stories to tell.  Hands themselves are wonderful and complex figurative models, capable of moving in a myriad of ways.
Aside from our face, no part of our body is quite so expressive. They are wonderfully adept at conveying aspects of our individual selves that would be hard put into words- aspects of our emotional lives expressed in gestures, and our physical lives written on the flesh.