Been following this on your blogspot blog, too, but thought I'd comment here a I don't have a blog account. I think you've done a great job with this mini (one of my favourite sculpts).
I saw someone post somewhere about the eyes, saying they felt they looked unfinished painted white. I'm torn on that. On the one hand I think white eyes is super-creepy. But on this scale of miniature, I think it can make them look unfinished, particularly as many people don't paint eyes at all. So if you wanted to maintain the creepy but minimise the risk of looking unfinished, maybe a pink dot in the middle, or something, would help?
Your suggestion of glazing some purple into the skin recesses is a good one, I think. I have a small Adeptus Mechanicus force; I did the flesh in Dheneb Stone to look pale, and glazed purple in the recessed, and red around implants, to make them look unhealthy. So not a million miles from where yours are, although I think your overall skill level is higher than mine.
I am still yet to paint any of mine, really should get to it! I am going for a more feral look so that could be an interesting contrast to your tech look.

When I get around to it...
Your miniatures (the Fimir too) have a very rich, warm tone. I was wondering, do you wash/dip them in a warm brown or something? Or perhaps it could be the photo lighting? Mine often look a little stark/pallid, and while that's often the look I want, I would like to be able to create other effects.
