It's good! pretty ironic considering that the picture is of a hand's shadow and your user name is handless. =]
If you wanted to improve the picture, I would make the rocks a bit more realistic. The hand's perfect, its only the rock wall that's throwing the picture off. You could do that by giving them more texture (a more granite- or a gravel-like feel, maybe?) and not as 'round' shadows. Rocks aren't perfect circles, and if you made the shadowing a bit more scattered I think it would make the picture better.