Looks awesome! A few critiques on the surfacing:
I love the contrast on the skin now (perfect!). I would add some subsurface scattering and maybe a dark green color to the subdermal scatter (just to give it the look that he has some density).
The black around the kneck and around his waist area is too flat. I would probably use a lighter color and something less contrasty. The belt buckle also needs a bit of detailing. Maybe a higher res and some alien sort of space federation logo?
The fingernails look awesome.
The lines you have on the front of the metal chest plate thing look asymmetrical. I think I would remove those or add some kind of bolts or like this:
http://spaceflight.nasa.gov/gallery/images/shuttle/sts-121/hires/iss013e48788.jpg
You could also add the dust, scratches and dirt like you see in the image above. The white, llike you had before, might look really cool with the space shuttle type of texture. Lots of good space ideas there.
I also picture him holding a sidearm like the glass and metal one here:
http://www.projectrho.com/rocket/rocket3l.html
Good luck and I hope to see more updates!!