I was going for top right-ish shading on the face, but I suppose the center of its face kind of goes against that. In the bottom right, those are two aliens talking in the hangar, sort of off-screen, just to fill space so it didn't look so bare, really.
I think the shading on the things that come out of the top of the nose is very weird. the rest of face shows a lightsoucre from the direct top, so why is one of these things on the top darker than on the bottom and the other one is the direct opposite? also in the lower pic whats that in the lower right corner? nice otherwise. I like the way you added details on the wall in the background.
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