Okay, let's see... Where to start.
Palette could definitely use improvement. Some of the colors are way too saturated.
His hair's pretty shiny. Is that some sort of new product he's got on it?
The darkest skin color is almost identical to that of the belt buckle, so unless you want to change the buckle's color, it's not needed. On that note, the darkest skin shade resides on the side that the hair's being lit. It's as if the light is coming from two different directions.
Quick
edit recreation:
Tried to address problems with lighting. Also used a lot less palette colors. I think it turned out alright.