This shows good framing, but the sun is above and behind the horse, making him hard to view. Shots taken with the sun directly overhead will put all the highlights directly on the top - losing the definition of muscle on the Horses body Early evening or morning shots will often show the horse in the most flattering light. Fairly good position of horse to sunlight, background is too loud and distracting. Shots taken with sunlight hitting directly on the side is too harsh and reflective, causing very long and distracting shadows. This framing is too close to the horse, and he is not against a contrasting background.
Sunlight is also above and in front of the horse.
This makes the horse very hard to view. Try to find a contrasting background. If the horse is light in coloring it often will not show up well when framed by the sky. Although it would be better if the horse had more space in front and behind him,the background is good and the horse's legs show in the photo. Same frame, but too zoomed in, the horses legs are cut off from viewing.