Yeah, there are a lot of little issues with it.
Some of it's just the state of what I've done thus far; for example, I probably need to re-do the normalmap for the Annihilator again, it's proven pretty difficult to get that one right and the lighting still feels crummy. I just did the Crusher with the same method I used on the Swimmer, and it came out much better.
Some of it's just inherent to making things that are, in actuality, flat, feel 3D; there are uncanny-valley issues when apparent heights and all that don't work out. Like with the shot of the Eagle; there the Thumpers / Chainguns feel a lot "taller" than the Eagle and the other turrets, which isn't ideal; it's an issue that can't really be avoided entirely, though.
Other than weapon heights, most of it would be cure-able if I was starting over again and working with 3D models from the start, because that's pretty much the only way to do this properly. But the time investment is a no-go; I had a hard enough time digging up the time for this mini-project.