Hmm.
-Replace the red dots with actual Shivan fighters and bombers, in the foreground and further away. They don't all need to be tiny.
-Fix the lighting. Have Earth's surface lit and everything else lit in the same way; everything looks ambient right now.
-Find a better Earth model, or use a hi-res picture. There are no clouds on it right now, little atmosphere, and no lighting.
-Throw in an Arcadia and a few other feeble Terran ships cowering before the Lucifer's might.
Otherwise it's a good start. I think I saw something like this in one of the art galleries.