This is probably one of your best pieces yet. The stream in the centre creates an object for your eye to follow, leading the viewer on to the wind turbines, which, I presume, are the main deature of the piece. The grass seems to be blowing away from the viewer, which also leads the eye to the wind turbines.
I love the way that the sky seems to dissapear into the land, almost as if behind the turbines, there is an infinately large drop. The coour of the sky contrasts brilliantly with the ground.
The turbines stand out realy well from the sky, and also the ground, making it obvious that they are the main feature.
The only criticism I can think of is that the stream is not quite central, but this does not cause any problems with the piece.