Charcoal Drawing 2

We were then given another image this time venturing into drawing the back of a person, and digging out the muscles so that it was clearly visible to resemble the back of a person.
I found this quite satisfying as once I could see I was heading in the right direction I felt more confident that I would be able to create a realistic image of the persons back muscles.
As you can see in the illustration I began to dig out the darker parts that was the shadow, to help create the illusion of a 3 dimensional figure.

Character Concept
Looking at this illustration I could see this character possibly being a sprinter as the image looks as though he is running, although because his knee is so low down, its possible that he has just fell while running.