A lot of good stuff have been mentioned already, but one thing I noticed was the right leg. I feel like if you don't raise it, it will be more balanced. My painting professor told me once that one has to be very careful on cropping the legs, and that if possible, just include the feet too. That said, seeing just one knee makes it feel a little off. Like a cup that's at the very edge of a table that makes you feel uncomfortable because you don't know if it will fall off. That feeling kind of cancels the dynamic essence of the composition, which by the way you do have. Anyhow, good concept! He is giving me the creeps, in a good way.
Cheers!
