From the size of the control deck windows, it's not that big. There is also a lot of structure invested in that large gun like object. Seems military, relatively small, so how about a Fast Attack Craft? If it it Terran, it might get the name of a historical character.
The general shape is really well realised, but personally I'd cut down on the more random pokey-outy bits. Ships generally only have pokey-outy bits when they really need them, otherwise they tend to be uniform in ship.
While I agree with the above statement for most ships, I feel as if the juts and and what not add character to this ship, it feels more like a cobbled together vessel then an actual class, another point to make is that the background round is cluttered with debris of some sort.
Oh and I think you should name it:
"Starboard Angel" because that seems to be the dominate side.