It might just be my monitor but the pictures aren't really doing anything for me. Maybe you could try bringing up the color of the trees and grass as well.
I don't mind it being a little unreal, I like to overblow colors and such. I turned up my monitor's contrast but I still don't really like the pictures. I don't really see anything interesting going on with the sky or anything, I'd suggest taking a picture at a golden time of day which you can figure out for your location with http://www.golden-hour.com/ .
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