With the lighting on the clothing being so dim, I'm surprised by the harshness of the highlight on the arm. I think you should bring the rest of the piece up to the same contrast as the arm, shading-wise (the metal is currently less shiny than the skin, which is just not the way of things =P).
It's a tricky pose for me to analyze, but I would say that the arm on our right looks too small, or the torso looks to big. It's hard to tell with the foreshortening and everything.
Additionally, the side of the torso that's on our right looks wrong somehow. Difficult to say why, but it's so unbalanced compared to the left side, and just looks funny.
It's tough to say why something looks wrong when I haven't spent enough time studying what looks right =P
