Another really nice bit of work. I especially like the color work you did on the suit.
On a less related note, I always found it strange that the helmet for the Space Jockey has such a insect like look to it, while the head underneath is so drastically not. Of course, taking into account how advanced the Engineers are, and the fact that what looks like an insect to us may be something entirely different to them, maybe it's not so odd?
Sorry for the rambling, but it was just something that occurred to me.
I can't help but wonder if it was an aesthetic choice, or buy design? Or even if, considering they are bio-engineers, the suits are partly organic, and once they seeded Earth, part of that somehow got into the mix? So as a result insects inherited aspects of the suit?
Also great critique, I agree with you.