Very nice. I really like your presentation in the fourth one.
There are some "interesting" streaks in the upper right 1/4 of the first one.
Paloviejo wrote:
This NP is about 35 miles east of Alamosa, CO where the flat land meets the mountains. The wind blowing from the Southwest piles the sand up against the foothills and has created a permanent series of dunes the tallest of which is about 750 feet above the floor.