Damn Elbows

The problem with drawing anatomy without a proper reference is fleshing out the volumes. I can definitely outline the shapes, but especially when I have to add a dramatic light source (or two), it's hard to get the proper volume. I opened this file again a day after I sent it in, and was horrified. It just looked... wrong. I retooled the body, and shortened all the elbows, which looked fine in a fashion-y illustration-y rendering, but when shaded to be more finished, just looked like I didn't know my anatomy - too long, and deformed. Don't know if I've proven that point wrong with this one though. Damn, I need a proper reference...