Been spriting for a while, want some professional critique.

[leetspriter694]

I've worked on this sprite for around a week now.

What do you guys think? What should I work on, exactly? Do you think I should work more on my technique? I was planning on coloring it after getting some professional critique from you guys, as I have heard you are pretty experienced.

I'm thinking I might want to add more frames to the punches.