Marcia Pitt and Her Brother George Pitt, Later 2nd Baron Rivers, Riding in the Park at Stratfield Thomas Gooch (1750-1802)

The picture has something of this: cavalry, seated, people, man, mammal, wear, horse, equestrian, sword, rider, horseback, military, two, saddle, recreation.
Perhaps it’s a painting of two people riding on the backs of horses in a wooded area with a house in the background and a tree in the foreground.