I think that the bales look a little soft. Also they may have benefitted from a different viewpoint. The green woods on the right are very dominating. I would have contemplated using the tracks on the left slightly more into the pic, from a lower angle and the bales dominating the shot more, just one or two. Couple that with the yellow straw and a darker blue sky and that would be a nicer shot - In my opinion.
On your other 2 shots, I think I prefer the 1st, but it doesn't really grab me.
Hope that helps.