Louis Michel van Loo – Louis-Auguste, Duke of Berry (1754-1793) Château de Versailles

The picture has something of this: people, portrait, woman, wear, cape, veil, dress, sash, man, opera, music, royalty, queen, costume, theater, girl.
Perhaps it’s a portrait of a man in a red, blue, and yellow outfit with a blue sash around his neck and a black tie.