Really nice image.
As for the lighting; It's not 'right', because it doesn't match the background. If you reduce the lighting around the starbord bow area and increase the lighting around the stern, then it'll work much better, because based on the planet the light is coming from astern (viewed from the ship).
The way the model is lit you have a soft light source all over port and then another shiny light on the starbord port section. Doesn't make sense.
I have taken the liberty and illustrated what I mean via Photoshop. Only a very quick 'sketch out' and by no means perfect, but I hope you don't mind: [link]
I didn't mean to nitpick too much, but I figure it helps more than just saying "awesome". At least I prefer that.