This is great. You always give things a real sense of three-dimensionality and this portrait has such a dramatic look to it!
Very cool. The face structure is so well rendered and you've really made the most of the palette. I especially like your use of the green.
cjlsm123 is the techno viking? That is so cool! Anyway, great work, you definitely have my vote! 
Awesome! I like how the beard fades out and the straight sharp cuts for the cheekbones and temples.
This is pretty damn good. I don't know that all the color choices quite work (most notably the patch of pistachio green to the left of the nose) but there's a lot of cool stuff going on here - the dithering on the lips, the weirdly shaped highlights, the way the beard sort of fades into nothing - it's all very cool.