Great composition, but in very serious need for noise removal. Given the uniform blue sky, you could fairly easily select just the sky and then blur the heck out of it, leaving you with no noise. The compression artifacts don't help either (you realize your file is only 50KB, so you've compressed three times more than you need to?).
Simple and beautiful composition here. For my tastes, the sky noise should be less, and the image sharper if possible - but again, simple, beautiful composition. Well done and best of luck in the challenge!