Heya, nice job! You definitely improved the perspective on the shoulders in the last two edits.
Also, I like the way you made the abs o' steel there readable in such a small space. I think the face is good, too (it'd be neat to see ya try a few expressions on it - it's got more space for that than a lot of the sprites I find myself doing). I like that you added a colarbone in the last update to.
As far as crits, you might be able to define the front-most bicep a bit more by adding some shading between it and the upper shoulder muscles. Also, the frame where his left foot is forward, I'm not sure the right foot is far enough behind him. IOW, I would think that foot would be located a few pixels up and to the left with the knee bent just a bit more. Could be wrong, tho.
Keep goin!