CAXNNA29 Arnold Böcklin (1827-1901)

The picture has something of this: people, nude, motion, woman, side view, mammal, barefoot, man, two, wear, action, reclining, tree, beach, position, monkey.
Perhaps it’s a painting of a man sitting on a rock in front of a body of water with his arms stretched out to the side of the body of the water.