On the shores of the Gulf of Naples Alexander Ivanov (1806-1858)

The picture has something of this: people, nude, reclining, seashore, group, water, shirtless, man, two, daylight, facial expression, sea, recreation, beach, tree, mammal.
Perhaps it’s a painting of two naked men and a woman on a hillside with a view of a town in the distance and a green field in the foreground.