New at Blender - Repair spaceship

Tell me what you honest to god think. I need all the positive and negative feedback to work with. This is the reference picture:
http://img230.imageshack.us/img230/6522/ship5pm2.jpg
And this is what I got. It will soon be fully animated:
These are the engines, they’re supposed to be crystals I think…
http://img154.imageshack.us/img154/6538/untitledtj3.png
This is the repair arm.
http://img87.imageshack.us/img87/9000/untitledoo7.png