I like the subdued colors but think the heads of the wheat should be brought out a little bit (contrast). Horizons that are halfway usually tend to sort of a boring photo. Maybe if the top half of the sky were cropped off (getting rid of the traces of contrails)?
It seems out of focus to me. Or focussed on the stuff in the front and not the back, which I think is where the focus should be.
Stunning shot I love it.
Its a nice shot of a lovely sunset but its not really saying much to me as I like to see some kind of focus point..You might be better to crop more from the foreground to give the sky more impact or as said above bring out the detail in the wheat more..