UPDATES:
I'm very happy with how the muscles are turning out. The back, chest, arms, are all more defined.
I actually went back to redo the hands so they look quite different now. A bit wider, more defined/detailed and flow more naturally into the wrist and further to the arm.
I also started the teeth. There in place but not finished as far as little details.
Pics (sorry for size, was too lazy to crop):
Here are the teeth and a slightly more detail head/neck.
Here you can see the defined back muscles and the smooth flow of the hands to wrists to arms.
Full body shot.
Thoughts? Comments? Criticism? Tips?