Thanks for the suggestions. Regarding the foreground: that's my fault in increasing its exposure and saturation. I agree that it's a bit much and plan to lower both. I've been experimenting with context fill and other removal methods for the powerlines, but so far the results have been rather disappointing. I think I can clone out the airplane's contrail without major issues. I am also thinking of cropping out everything but the two righthand trees, but haven't spent enough time to know if this will improve the overall image.
Bob