Very cool set of shots. I think #3 is my favorite, nice work with the B&W, the tones and shapes in it are sweet. I like #2 and all the patterns in the small hills.
Dawn would make them better.I have been out there a few times but the 3 hour advance start sure does make for a long day. Sunrise is good because you can keep moving to get the star flare for 1/2 hour.