I'd say there need to be more logical connections. The missle launcher for example, looks as if someone had just cut a hull into the armor. You could add a border around the hole. The cocpit looks glued on. Make a connection between the glass and the hull.
The plates look like they came right out of the factory. Smooth, no scratches no dents, no dirt. You could add some kind of wavy structure, that comes from constant heating and cooling in space. Like paper that got wet. I see, that you added some abrasion of the paint, but that's just at the borders of the plates. The whole surface needs some kind of structure. Unless you dont' want it that way, of course. But i think, that even after just a few sorties some structure would appear there.
