Strong Arm Photoshop Rendering

Lately I've been practising my rendering techniques in Photoshop. For the most part they have been basic blending techniques consisting of gradated blends from light grey to black and once I was comfortable with that I moved onto rendering spheres. When I felt comfortable with my rendered sphere, I decided to put what I've learned to something that was a little more challenging, so I found a black and white photo of a body builder posing and decided to just do the fore arm. I'm quite pleased with the overall result.