Anatomy of the Arm

I decided to draw the arm and shoulder complex  using just the muscles and bones. I found the site Posemaniacs.com very helpful.  The site has models in different poses that you can rotate for a 360 degree view.   I used the same pose to show the arm from the front, side, and back. The models on this site are all muscle and bone with no skin.  The site also has models that are hyper super muscle on top of muscle for practice in fantasy drawings. 
I started to use my color pencils to color in the muscles and show the direction, but I didn't like the way the colors worked out.  I think I will try water color next. I need to work with my color pencils too so I will play with them and see what I can do.