First off: Holy crap. Beautiful palette, nice use of it and wonderfully made overall. I really enjoy what you did with the eyes, it's exactly the kind of dead dark circles I was hoping for. Just a few things are off or could be improved, for example the light purple being used to aa the outline to the background isn't doing anything. It doesn't smooth anything, and I'd say you've have better luck with just removing it. You could've cut into the lines a bit with aa to get them to look less chunky, like on the shoulder in the shadow. Overall though, it's really great to look at. Loving the mood of it.

Thanks.

I put the purple for the AA because was the closest color. Then I look at it and I thought: "or it makes a slightly difference or simply makes nothing, so why not keep it anyway, nobody will see it".

Now I realize that would be easier if I just added another color for the AA. So here is how it looks now:




And here is a version with what I think you would have done with his eyes: