Well, I certainly am in no position to give advises on painting (as I'm pretty new and not that great at it myself), but here's something I found out - if you add some shadowing from the hair on his face and from the jeans on his body, it'll look much better and will "put it in the scene with him", so to speak. Also I noticed that the jeans' texture looks really good, but there are a few spots where it looks "smudged" and pixelated. Maybe you can fix this. Oh, and one last thing I just noticed - his right arm is supposed to drop a shadow - it does on his body, but the shadow is cut where the jeans starts. You could lower the opacity of the layer in which you painted the jeans, and then take a brush and paint on the jeans the shadows like they were rendered on the body. I really like his face, by the way! Is it V3 or Mike? He looks great, either way! :)