I agree that "shadow" detracts from the picture. After looking at it for a bit, I discovered it is actually a little ravine where the field is cut at a strange angle. I woul dgo back and reshoot it, but I think the flowers are past blooming again and the sky is not as dramatic.
I'd like to see a wider version of this. If zoom was used, zoom out and give us a feeling of how big this field really is. That shadow on the left is a little annoying as well. If recomposing without it was an option it would definitely help.