glrx-1538 Friedrich Gauermann (1807-1862)

The picture has something of this: mammal, cattle, cow, livestock, herd, farm, bull, agriculture, grass, animal, rural, field, grassland, pasture, herder, hayfield, cavalry, group, outdoors.
Perhaps it’s a painting of a herd of cattle in a river with a man on a hill in the background and a dog in the foreground.