I love the shot, and found myself staring at it. But as I stared I started to notice a couple things that detracted. First, it looks like a big screw instead of a nail. :) Second, the lighting on the boy's face is a bit odd, which makes it kind of a washed out block of white.
Besides that though, lighting and shadowing are beautiful, and the idea is top notch. I love especially the dark of the hammer versus the light of the skin.
totally love the idea but the class 8 chrome plated bolt and Rubber mallet are asynchronous with the setting. if you had reached a little more for realistic props this would push a 7 or 8