A Portrait Of The Racehorse Harkaway John Ferneley (1782-1860)

The picture has something of this: cavalry, mammal, horse, mare, equine, seated, stallion, racehorse, people, animal, mane, farm, chestnut, equestrian, two, mustang, livestock.
Perhaps it’s a painting of a brown horse standing on a dirt road next to a field with trees and a hill in the distance with a bird in the foreground.