John Levett Hunting at Wychnor, Staffordshire James Ward (1769-1859)

The picture has something of this: cavalry, seated, cowman, people, mammal, horse, saddle, mare, two, man, rider, lid, herder, water, mustang, recreation.
Perhaps it’s a painting of a man in a red coat and top hat on a brown horse with a river in the background and people in the foreground.