I don't like the top. It looks messy. The background render is blocked by the one in the foreground; the lighting on the hair of the foreground render cuts too sharply into the white.
If you cut the top off, leaving the bluish area and the foreground render, but removing the rest of the render(s), it'd look a lot better. Even if you did that, there'd still be the problem of the hair, which would still cut sharply into the background. You'd need to make some blending changes to get it to fit in. Then it'd be even better.
Finally, it's a bit square and the border's inconsistent (the former would be pretty much fixed if you crop the image as I suggested).
5/10 at the moment; potential for 7/10.