That's an improvement! I would recommend covering the ENTIRE background with something such as an ironed sheet, and using lamps to improve the lighting. Presentation is, honestly, half your builds success. Still, this was better than everything in the room. Secondly, the colors are still pretty random. I'm glad you're using mostly gray, but try to keep it almost ALL one color, with a few details in other colors. Third, you've got a great start. The shape is right, the proportions are right. Now let's take it to the next level. Go SNOT. That stands for Studs Not On Top, or in other words, incorporate tiles into the wings and smooth rounds into the body. With those three things done well, this build will go from good to excellent. You've got the stuff it takes, now blow me away. Good luck!
This is a bit different deal, and I understand that, but here's a good example of a studless ship by Mark Stafford.
http://mocpages.com/moc.php/112517