The more contrasty textures of the bottom shots is much more interesting than the washed out texture of the second shot. And presumably the first shot, although you can't see the texture with that lighting.
Don't stress about logic, PGF is being a pedant. This is for entertainment, not military schematics. Like Pete said, if you're going to get that anal about details you also shouldn't have any sound in the game.
As for people saying it looks too nautical, well yes it does. Why is that a problem? Most sci-fi I've read has large starship fleets being Navy. Come to think of it, your ship reminds me of the SDF-1 from Robotech. Right down to the square thrusters, as well as...
Are those landing pads on the front and rear decks ? What for ?
For launching small fighter craft stored in the larger ship. duh