Caspar David Friedrich (1774 – 1840) – Moonrise over the Sea Alte und Neue Nationalgalerie (Berlin)

The picture has something of this: sunset, dawn, sea, lighthouse, seashore, water, rock, evening, beach, people, ocean, light, landscape, dusk, tower, outdoors.
Perhaps it’s a painting of a man and a woman sitting on a rock looking out at the ocean with a sailboat in the distance and a lighthouse.