well, let's see.
The manip it self was pretty short and kinda stiff, some movements were slow (maybe at frame 300) and moving only your lower body part (on 350-400) make it look kinda bad and stiff. You should try to practice more your movement and try to be a bit more smooth, don't forget any part of your body. Well, Dm's and pose were okay, same here, try to make smooth and aim a bit better your hits (btw something i forgot to say, the punches looks pretty cool (or at least the split punch look pretty nice)), you may get a boom, who knows, it depends on how you edit it.
But well, since it was your first manip i think it's okay.
Btw, how much time did it took you to make it? (for real, don't lie to me >:c )