I think those crits really helped, it's looking much better. The UFC approach looks nice too.
His proportion is pretty good, though at this stage I think it would help to do some photo overlays, and make it match some good reference as closely as possible. [3dsk stuff is good]I like the shape of the arms, though I think your muscle forms are too deep, especially in the neck, chest and torso. I'd just study the athletic body type more and smooth things out a little, as the forms, especially the abs, are really harsh. Hope this is helpful!