I think if you bent the leg more on the squash, when he puts his weight in that leg, it would make the character seem heavier.p.s. Yeah Dude
i really like the arms! You could show them flexing even harder by having a muscle pop out when the arms go up.
I agree that he could be squashier.. maybe add more "swoop" to the shoulders.. yeah dude. More swoop. I think you've got everything covered -- Swagger, sweet shades, firm glutes? Yep all there.