Portrait of Anne, Lady Grenville, nee Pitt John Hoppner (1758-1810)

The picture has something of this: portrait, people, woman, girl, model, dress, face, fashion, wear, princess, vintage, nude, veil, lid, queen, lady.
Perhaps it’s a painting of a woman in a white dress with a blue ribbon around her neck and hand on her hip, sitting in front of a dark background.