Nose is screwed up, but I don't need to mention that. For some reason it's looking a bit cartooney though.. I absolutely love the engines and midsection, and think the transition there is fine, but the launch pods are looking a bit too short and stubby, and the the arcs in the midsection are too high.. sort of reminds me of Starcraft II syndrome - they took a gritty looking game and made it look cartooney and clean.
My advice is to make the launch pods extend further backwards, and maybe even have them funnel into the area where the engines and the midsection meet. As for the arcs...
Edit: Okay fix'd. Also, DON'T forget to leave room for turret mounts!