I think the fact that there are so many sunsets in this challenge hurts you. If the bottom half of the shot were more interesting, it would match how spectacular the upper part is and make this have more appeal. Looking down into a valley, etc. I also think the bright yellow/orange sun line that runs across the middle of the shot should not be so in the middle. Maybe getting rid of some of the ground would help.
Wow - amazing colors. The yellow almost pops a bit too much for my eyes as they keep getting drawn to the middle, right hand side. My favorite part is the bottom third. Nicely captured.