The palette is wonderful. I love the definition to the face, and especially the collar for some reason.
The hair is bothering me, though. The way the highlights are placed makes it look really sharp and sort of random.
Good utilization of the blue and purple hues. I don't really like the way the dithering of the stubble looks, but at this size, I can't imagine there are many other ways to go about it. Good work.
Nice colorscheme and the portrait works with its touch of British 80:ies.