i dont think deviantart let you do this so ill just give the link
http://www.deviantart.com/deviation/25463673/

The hair shimmer you have is quite cool looking.

I'd say bring the hair highlight down more and give it a U shape curved to were his hairline is somewhat. Also, to really give it that hit of color shine make the sharp jags in the highlight more narrow/long. I'd say from it his hair looks wet from how high it's placed.

The mouth is a touch to out on his cheek, could've probably cutted a bit off on the left is all. Hmm, I think the eyes would look alot better here if you made them narrow. Believe it would match better with what your going with.

Coloring wise, avoid using Color burn so heavy off the start on skintones. This really limits what you can do next and try not to make colorburns/dodge so symmetrical in my opinion or your going to get a lollipop effect were it looks odd.