Old Billy, a Draught Horse, Aged 62 Charles Towne

The picture has something of this: cavalry, mare, mammal, horse, stallion, animal, equine, farm, mane, grass, livestock, field, grassland, foal, seated, hayfield, landscape, mustang, nature.
Perhaps it’s a painting of a brown horse standing on top of a dry grass field next to a body of water and a sky with clouds in the background.