Rokotov, Fyodor Stepanovich – Portrait of Catherine II (3) Hermitage ~ part 10

The picture has something of this: people, veil, costume, wear, woman, crown, theater, portrait, opera, festival, queen, man, princess, dress, gold.
Perhaps it’s a painting of a woman in a blue and white dress with a red chair in front of her and a red drape on the wall behind her.