Sig prices really went up while I was away, eh?
Sorry, to drop in, just wanted to leave some CC.
I like FooFighter's first one, just a few things that could be tweaked:
maybe go for a more sky blue tone, lighten the glow around the render and cut it off at the bottom, so the render border gets synched with the box border. Then adjust the small font under 'Lilith LaCroix' so it gets a bit more readable - that or tune down the black border around the font to 50% opacity.
Revan's entry is okay - but the model in the left is just way too blurred/filtered (what was that filter in PS again?) - and the lighting doesn't fit. I'd suggest a more fitting, sharper render. Also. lighten up the battleship renders and go for the colour scheme Mike suggested - generic light blue, whiteght grey, a slice of bordeaux should look great.
Keep it rolling, lads!
Here is an update!
Comment - I couldn't find any better real human picture more identical to the one in your drawing-