Yes, it's okay for you to post ships on the forum to receive feedback and constructive criticism to try and improve it before posting it [in the BP thread].
As for the ship itself, it's alright.
There is a mirroring/centering errors which is obvious around the center of the gap.
The outermost, forward-facing guns look stuck-on and don't flow well.
Some parts look bad and squarish, especially around the launch areas. (I'm assuming they're launch areas. I mean the spot with the yellow light.)
The use of those "shiny" manifold type pieces is iffy. Are they all for engines? If they aren't, then I'd rethink using them for two functions. If they are, then the higher, center set look funny next to the rest because of the dst sections on either side while the others don't have them. In fact, the shiny and dst clash there regardless. I recommend doing away with one or the other in that particular spot.
Other than that, it's fairly good. I wouldn't say it "needs" color, maybe just some better shading to make it look more interesting.
edit: Thanks arc, I'd have caught that in a moment.