First, try to add some details to the texture. You just painted over the whole mesh indiscriminately, which isn't a good thing. Mark intakes, engine exhaust (could use glows, for instance), as well as other bits that are clearly not part of the main hull. Also, make a plain, unpainted texture. Those camo schemes are ugly IMO, I'd rather have a plain version. And definitely don't use blacks in the camo scheme-they make the model look like there was something wrong with the shadows.
Oh, and another thing. Don't think that putting external models over actual, modeled guns is any excuse for not properly texturing them. I'd also appreciate if the obvious turret actually moved around.
That said, it's a nice ship. It needs a lot more work, though. More detailed textures are a must, this looks like a very lazy job that hides most of the model's fine details.
