It's hard to say without being there, but the feeling I get from these is I want to see a bigger area. It feels to me like I'm looking at little bits of an image - perhaps try shorter focal length or panorama? Aside from that, I think there's a lot of potential here. Try and avoid things though like the cropped tip of the middle saucer in #1.
Just my $00.02 worth - your mileage may vary.