Nice! Another Goro animation!
That looks great, man.
Once again, love what you've done with his hair, which looks rough and not smooth like a woman's.
Also like that you clenched the lower hands but not the upper left.
Don't know if it was that way in the sprites but it just looks right.
The only suggestions I have are some tweaks to the motion of the punching hand.
First, I'd try to eliminate the downwards curve in the path of the fist.
In all perspectives, the fist's path should be a straight line from the starting position (when the elbow is flexed) to the end.
Also, I'd try to keep the elbow bent for a little longer.
The punch should happen as an upwards ripple from the hip to the hand
- Hip rotation
- Shoulder rotation + torso leaning forward
- Elbow extension
The elboy should stay mostly straight up to the point when the body stops, and then the body should lunge a bit forward when the arm extends and the punch peaks.
Although greatly exaggerated, this may prove illustrative.
Also, maybe it's just me, but I feel his ass area looks to oily and his shoulders and back look way too dark.