Ugh. I wasn't sure where to upload this. Anyway..
I made this for myself, as I use my hands for reference a LOT, but the room where I do my drawing doesn't have well defined shadows and the lighting is fairly horrible. Figured I might as well share, since the bone and muscle anatomy of my hands are pretty obvious.
This image IS ONLY FOR REFERENCE. It's NOT to be used for making textures or for photomanipulation. >:0