I'm no anatomy expert but I can tell you I think the piece does show a fair bit of dynamic kind of movement. I would only say that the red football player is rather straightened out in the body unintentionally. Either he must be absolutely stretched in his mid-jump-roll kind of thing, or he should be more hunched over in the torso .. I think.
Otherwise, good work, I'd like to see you do more work on it but of course anatomy should be fixed earlier rather than later. Helm should be able to shed some light on it.