Excellent models.
Both scenes are in need of some sort of lighting. At the moment they are too dull and evenly lit.
The ship one isn't so bad as it seems to be in some sort of cloud, so lighting would be lower and dispersed, however there appears to be a dark blue light affecting the underside of the ship and nothing else.
Also, notice how the pipes connected to the rear of the ship appear to float, detached? This is the reason I always advocate a sphere of lights casting soft, blurred shadows (using shadow maps NOT raytraced!!) , instead of an ambient light. You get soft shadowed areas around geometry connections making them look connected. Ambient lights don't cast shadows and just have the result of making everything look like it's glowing.
Also, kill the background on the female trooper, it's noisy, garish and distracts from the subject.
Crow