If you're texturing the impulse crystal on, add dark lines to look like frames to hold the glass/ transparent aluminium domes. Should be okay then. (If you're good on poly count, maybe model the detail in there.)
Textures are looking good, that blue works much better. If anything, I'd say it's just a little to dark. The Kelvin wasn't as dark as most people seem to think, if that's the look you're going for.
One last thing, maybe make the name and registry a little bigger. It may help to sell the size of the ship better.
All in all, it's looking great.