When I first saw this shot, based on the grass and the light, I was guessing it was yours! :-) Interesting perspective and awsome job with the exposure!
Congratulations on finding a unique perspective for this challenge. By incorporating the grass (sand dunes I take it) you've identified ground level. The sun coming thru below the grassline is very cool, I like the starburst. Nice use of angles to offset the blue - focus really isn't a major issue with an image like this - exposure & lighting are very good. Good luck on the challenge.