Couple of things:
I think the basic design lacks a vertical element. Looks a little flat.
Try maybe enlarging the rear half ? Or the engine areas ?
I'd remove the wings as they don't really serve any purpose. Try varying the width of the basic model with say, moving the leading half of the engine pods inwards or something ?
Some of the details (such as the, I presume, the side docking points) are a little too smooth. If poly count isn't really an issue I wouldn't worry too much about that though.
Overtiled. Plus I reckon you've overused our old mate the AWAC tile ( though from my own experience I can appreciate why). Could really use unwrapping but that's easier said than done 'course.
All this is intended as construction feedback and isn't meant with any hostility. Would have been better to post more screenies as I can't really see why you would want to release unfinished work
