A Portrait of Anne Josephe Bonnier de la Mossau (1718-1787) Duchess of Chaulnes, as Hebe the Goddess... Jean Marc Nattier

The picture has something of this: people, water, woman, girl, nude, underwater, nymph, river, recreation, group, fish, portrait, two, wear, sea.
Perhaps it’s a painting of a woman in a white dress holding a bird in her right hand.