Mary Robinson (1758-1810) as Perdita John Hoppner (1758-1810)

The picture has something of this: portrait, people, woman, model, lid, dress, wig, fashion, lady, girl, queen, veil, wear, costume, retro, fantasy.
Perhaps it’s a painting of a woman in a black and white dress with a feathered hat on her head and a feathered shawl.