Here's my attempt at muscles. Based on a challenge put forth to me by my friend and fellow artist, Anthony (ANMPH) Hary.
I actually did quite a bit of research into this. Despite my background in life drawing, The emphasis was on the human form, not the exagerated human form, as is common in most comics. So, I pulled as many body builder images I could find and went to work. I didn't want to pull from other artists because I wanted the art to be my own style.
I'm really interested in what you think of Hulk. Whether or not you think his limbs look appropriate to the muscle mass and so on. Lay it on me artists. Don't be kind. I need to improve.