Looks like it has potential - here's what I'd do...
Squash the tanker "pod" so that it's got a lower height value... it'll make it look more streamlined (and interesting). Move it up closer to the rest of the ship as well as it looks a little odd as far away as it is.
The rear section is neat, keep it more or less as it is I think. Perhaps extrude some of the faces on it to make it more detailed.
For the front, make it more traingular and angular with the point of the traingle facing forwards.
Alternately it looks a hell of a lot like this:
And thats not a bad thing - could give you some ideas

Good luck!