Mares and Foals, facing right Sawrey Gilpin (1733-1807)

The picture has something of this: cavalry, mammal, horse, mare, seated, two, racehorse, farm, stallion, livestock, foal, pasture, equestrian, mane, equine, mustang, colt, grassland, agriculture.
Perhaps it’s a painting of three horses and a foal in a field with.