I like the sky, except you could bring out the detail a bit more with dodging and burning. I like mill, but it is a bit dark compared to the house on the left. Maybe the reflections could be a bit lighter and finally the foreground could be a bit darker or perhaps a bit more of the grass. If you have an opportunity to retake this I might try to get a bit lower

Having said all that it is a nice picture.

Cheers Rex