Nice idea and pretty good execution. Would be better with more DOF / matching sharpness on hand. Stop down more and/or move hand further away from camera and crop. Beautiful waterfall.
Cute idea, but it doesn't QUITE work, I think mainly because the focus of the hand and the rock it's supposed to be holding don't match. Nice waterfall though :)
I don't like the colouring on the hand. And the fingers really don't look like they are grasping the rock; there is too much space between it and them.