It's a great photo. I have no negative critiques on the picture itself. However, there are some odd artefacts due presumably to the sharpening software? (I have noticed this on my own images with I think it's Nik Sharperner?). Some of the grass in the top third of the image looks off (over sharpened) while adgacent areas look normal. Likewise the very last horse, the top third of her head is overly sharp compared to the rest of her.
Here is my solution when the software does this to me. I work on it in Photoshop Elements leaving the new sharpened image as a top layer above the unprocessed image. I then erase the sharpened background and leave only the animal sharpened. This may help clean up the software artefacts here, on what is otherwise an outstanding photo.
