Minor edit to the feet; The pose might be a bit .. non-anatomical now, but it's dynamic
I felt I had the feeling that his feet should be a bit more leaning on the ground and maybe that he was standing almost on his toes, a battle:y thing :]
The knee also bugged me, i felt it didn't have a lot of shape, so to say. So a little edit there too :]
Hope it helps somehow. Good luck dammit 0:! And nice work so far.