I like yours better than Nannan's, just because it has an organic shape doesn't mean it's a good model. As far as I can tell, he completely lacks a way for the pilot to see, an interior, a prisoner holding cell, and a basis in the Star Wars universe. You've got all that stuff
Besides, i'm in love with this lady. It's just so wicked. Don't sell yourself short.
My Do's and Dont's:
I really love the "rib cage" effect on the side engines. Very smooth.
The shape is awesome, it's transcending the linear format of bricks perfectly.
The alien language is awesome!
Critiques, well, I would have liked to see continuity on the translucent parts on the big engines, either all squares or all circles. I also want to see pics on white, instead of grass, so you can do stuff like interior shots and bottom shots
Great job, mate.