Nice moments on most all of these. My suggestion would be more "lead room" for the horses to "run into" on images 2,3,and 5. Psychologically, we want to see notably MORE room in FROTN of a runner, or horse running, or a vehicle, than an equal amount of space behind. That so strong a preference that on #3, the one with the girl on horseback, the horse running through a field of buttercups, that you could crop right into the horse's hindquarters and lop of the tail, then cut the top of the frame down, and make a lot more room "in front", and the image, even minus the tail on the horse, would look more dynamic. It's already a wonderful moment.
A second comment: this horse has a simply GORGEOUS coat and color for photography...just wonderful. Sooo beautiful!