Silent rage: not sure if you’re still working on this model, but if so, here’s my 2 cents. The trapezius as well as the lats look too big, and I also agree the quads could be bigger… In the front view on your first post, it he looks like a muscular but not super-exaggerated guy with this huge ball floating behind him making up the trapezius and lats. I can’t tell if you’ve toned them down in your second post due to the angle. It seems like you’re interpreting that reference image too literally; in the reference image, he’s leaning forward, so there is a lot of area on his trapezius facing the “camera,” and his lats are foreshortened making them appear to bulge out more than they would from a front view. I think in the links to other ref images you provided he doesn’t look quite as stylized and bulky in the upper body.
Anyway overall I think this is a fantastic piece, the muscle placement and overall proportion has a lot of detail so is interesting to look at, and it’s believeable despite exaggeration.