So, was a stumped about what to go for with his skin tones. Asked Matt Brooker as he's the artist of the design i'd based it on.
He said pale skin with dark eyes would be a nice contast, and plays up the fact that the Selenites are subterrainen. Tried it with a very pale regular skin job but the contrast was just TOO much between that and the black eyes.
So, had a rethink and decided to go for grey tones, figuring they're close enough to black to stop it being too jarring.
Trouble i'm having though is the grey is kinda bland. So am experimenting with colour washes to make it a bit more interesting