Excellent! The head is on the 1/3rd vertical plane. The eyes intersect the horizontal plane. The fence leads you to the eyes. Perfect lighting and dof. AND not a horsefly in sight! I so want to pet that soft nose!
That horse has character. He certainly looks like he is deep in thought. Nice use of the rule to draw the eye down his long face to the most interesting (to me) part of the picture, his nose!