Oberman, Anthony – De harddraver ’de Vlugge’ van Adriaan van der Hoop in de weide, 1828 Rijksmuseum: part 4

The picture has something of this: horse, cavalry, mare, mammal, stallion, equine, equestrian, seated, racehorse, mane, mustang, pasture, animal, farm, grass, pony, livestock, thoroughbred, fast.
Perhaps it’s a painting of a black horse standing on a grass field next to a river and several other horses in a pasture with a cloudy sky in the background.