This is the hand reference that I have made for August-September 2003 Official Classic Challenge in CGChallenge.com
Feel free to use it as a reference for your 3D hand modeling, hoping to hear what you will do using it...
Back view: http://www.correct-proportion.com/modules/coppermine/albums/userpics/10351/backhand01_low.jpg
Front view: http://www.correct-proportion.com/modules/coppermine/albums/userpics/10351/fronthand01_low.jpg
NOTE: I don't know if this pictures will apper until you make account in http://www.correct-proportion.com