Diana, Endymion and satire. 1849 Karl Pavlovich Bryullov (1799-1852)

The picture has something of this: nude, people, woman, Renaissance, shirtless, baby, man, god, saint, cave, underwater, baroque, water, reclining, son.
Perhaps it’s a painting of a man and a woman laying on the ground next to a man with a snake on his shoulder.