A little hot on his forehead and the red of the wall appears to be reflecting a little red on his arms. Try to desat the red just a touch to see if it helps. Nice expression and capture.
Interesting color choice for the background, but I do like it because it is different to what you would expect. I like the 'shininess' of his skin, especially on his arms. Maybe the spot on his forehead would be better if it was less bright. I really like his confident stare. Overall I like this a lot. 8.
This is a nice shot. For this challenge, I think it would've scored a bit better had you zoomed out a bit and kept more of the wall. I actually like the loss of definition on the subject's left cheek.