I like the variety of pastels in your sunset posting. That's pretty bold having that much negative silhouetted space in the foreground. I typically try to keep the negative space to well under 50% of the shot. As a result the foreground trees seem to be blocking a good deal of the sunset. Additionally, the foreground trees don't seem quite as crisp and sharp as they should be. I oftentimes have the same problem. When you figure out how to fix it, let me know.