Four colour awesomeness, love all the details of the face, how smooth these lines are, and that style - mwow!
It somehow reminds me on SinCity, and the style there - which is a good thing. I played a bit with the palette - or actually just with one colour - the one of the lines in the left. Setting it to the red you already have in the end of your palette, somehow makes it even better - but also more cliche.

So, uhm, very well done - hope I become as good as you one day