A Bay Hunter Held by a Groom James Seymour (1702-1752)

The picture has something of this: horse, mammal, cavalry, mare, equestrian, seated, people, racehorse, equine, farm, two, stallion, livestock, animal, pony, pasture, agriculture, mane.
Perhaps it’s a painting of a man standing next to a brown horse with a white stripe on it’s bridle and holding the reins of the horse’s bridle.