I especially like the area around the eyes. I think you've modeled his eyelids and brow well. Those black orbs are pretty captivating as well.
There's a problem I think with using bumpmaps, which is an issue within the game as well, where everything tends to look like wet mud rather than a firm solid surface. Maybe here it was intentional, but as Kran are silicon based lifeforms, I've always imagined them having a more translucent, crystalline quality, like an opal, rather than freshly mixed concrete. Just my thoughts, whatever they're worth.
I've only just started playing around with blender, and I haven't even touched the texture side of things, is there a specularity setting you can adjust?
The UV mapping looks good on his body and head, but the two look disjointed at the neckline.
Maybe a finer grained texture would make it look less rough and more smooth, depending on what you're going for.
Overall it's looking good!
