That's a nice start you have there. I like your use of terranim8or (I assume).
So here is what I think you could do to improve this:
In the first scene, the movements are smooth and nice, but they're a bit too uniform. Perhaps the radar should stay that way, though perhaps you also want it to rotate slower. The turret I feel should move a bit differently. Perhaps not just side to side, but up and down as well. It would be nice if they didn't necessarily move in unison as well. It's very obvious as a viewer and takes my attention away from the full scene.
As for the second scene, I feel you could speed up the spaceship a lot. I'm not sure what exact effect you're going for, but I doubt the ship would stay flying if it was going that slow. Next, the turning still needs a little work, but it may also be the camera. If you set the camera to have the spaceship as its parent, it will move the same as the ship, but also remember you can stray from this so that it doesn't follow it exactly (once again, following exactly behind would look strange and unattractive to the eye. Right now you have some good smooth camera movement, but it doesn't sync very well with the ship.)
As I said, this is a decent start. I look forward to seeing what you can do!