I'd cut out the white edges around the crew. Also, an easy way to give a 3D appearance is to make a screw member, duplicate it, and cut slots such that from the top it forms an "X". You eyes will be tricked into seeing a whole person. I learned this from Microsoft Flight SImulator (FS() when I noticed that the trees where not full trees, but actually one tree with another one 90 degrees on center. It gives a great tree. The white really detracts. IMHO. Looks superb otherwise though.
That saucer section looks absolutely peerfect. Kudos to for that. I think that's the most perfect looking saucer, from the top, I've ever seen!