First punch:
if someone punched you like that, do you think it would huirt?
Try to make it faster
Second punch:
Look at yourself in the mirror and punch. does your arm go back that much? (i hope not)
does it end in the same position as it started?
does it go directly back, or off to the side before you bring it back?
The beginning of the punches:
You probably wanna make this two sheets. one for the punch and one for the standing.
The way he pulls his foot up is unnatural.
Standing:
His feet are kinda shaky
I dont want to sound overly harsh.
Kudos tho. The sprite itself pretty good over all!