There are a few things that I've picked up on which I think you could do with some fine tuning - cos it is a great vector piece so I think you'd appreciate the refinement. First of all, the texture/meshing over the chest areas and abs, I would be tempted to make it a lot more contoured to the muscles rather than a distorted mesh over the top. It would help emphasise the body more and the muscles. Like the mesh is over the thighs, which is more contoured, but not so much over the knees. What I enjoy about your work is your digital painting style... which deviates from the clean vector edge. However I think what would benefit it greatly is some clean lines around the "line art" areas - such as the boundaries of the background. It seems a bit too rough and not as consistently smooth as the main character. I'd also play around more with the saving for web window, because there is some pixelation/distortion on the color dodge (assuming) white lines around the body... which we shouldn't see in vector.