Male Torso Studies

Numbered in the order that I did them. Felt like I needed to brush up on anatomy, especially male anatomy since I don't draw men as much as women. I also took this opportunity to practice rendering/painting and am relatively unhappy with it, but I think I had some improvements with 7 in comparison to one.

Please, please, please point out that would be helpful in learning to paint more efficiently and better... just problem areas in general. Color choice still bad? Too muddy? how can I improve these things?

I'm also wandering if I should try for a more painterly or cell shading type way of painting (not actual cell shading).

Everything done with photo refs.