Flinck, Govert – Mercurius, Argus en Io, 1635-1645 Rijksmuseum: part 3

The picture has something of this: mammal, cavalry, sheep, people, two, group, cattle, herder, tree, daylight, water, livestock, outdoors, moon.
Perhaps it’s a painting of a white cow laying on the ground next to a man in a blue dress and a woman.