The Bird of Prey is looking good. One thing that keeps throwing me is that I keep expecting it to be sleeker for some reason, and then in some shots it looks really chunky.
Maybe it's because I've never been as much of a Star Trek fan as I have been a Star Wars fan, but if you hadn't told me that was a render, I would have thought that was a still from the original series. Seriously, this is a really good model and your rendering skills are superb.