Yeah, and the back arm a bit.
Oh, and you also missed transparency on the passing frames ;)
Good! But one frame looks like it "sticks" on the arm.
Also some parts are jumpy
Yeah, I agree with BlackDragon, but perhaps also try to raise the feet on each step a little more, it looks to me like he's shuffling a bit more than walking.
I figured that would look more realistic. I set that frame to 150. I'll change it back.