I loveeee this piece, its very very sweet. It's very close to realism only one thing pops me out, that is the throatlatch on the horse on the left. I think its the shading between the background and the neck line that flattens it out a bit. The other is on the horse on the right, the chest in general is missing the quality of highlights you gave the face. I would push yourself to match the intensity of detail to the chest and necks as you did the faces as they are very well done. Again what a lovely picture.