Portrait Of Lord Stanhope (1805-1866) Riding A Pony James Ward (1769-1859)

The picture has something of this: cavalry, people, seated, two, woman, mammal, child, man, recreation, lid, girl, herder, group, three.
Perhaps it’s a painting of a boy riding on the back of a black horse in a wooded area with a river in the foreground and trees in the background.