I like this very much especially ~ seeing the curvature of the Earth. I think you may have left "a little on the table" by not bringing out some of the warmer tones available with the Sun beeing so low on the horizon.
Nice shot. I am not a big fan of horizons being smack dab in the middle of the image, however, there are some nice features in both the sky and foreground, so it works here. Will be in tough in this challenge. Good Luck. 7.