Where the heck did my first reply go?
Doh! OK, this may turn in to a repeat post if my original replies show up.
Anyway, I like these shots a lot. They are simple in a way - geometric, basically only two colors, uncluttered. But I really enjoy the different levels: first is the great texture on the sand from the rain. This is seen in the shots that include closeups. But then there is the pattern of the ripples in the sand. And finally there is the pattern of the dunes themselves. There really is a lot to appreciate in your compositions.
Spike