Gay Nymph (1947) oil on canvas Gil Elvgren (1914-1980)

The picture has something of this: underwater, swimming, woman, people, water, girl, nude, fish, light, model, portrait, diving, swimmer, sea, water sports, submerged, aquarium.
Perhaps it’s a painting of a naked woman sitting on the ground with a frisbee in her hand and a full moon in the sky in the background.