A Bay Horse in a Field John Boultbee (1753-1812)

The picture has something of this: cavalry, horse, mammal, mare, farm, stallion, equine, seated, racehorse, animal, grass, field, chestnut, agriculture, pasture, foal, hayfield, people, equestrian.
Perhaps it’s a painting of a brown horse standing on a lush green field next to a wooden fence with a house in the distance and trees in the background.