Flameng, Francois. Portrait of the Duchess of Dora Evgenyavna Leichtenberg Hermitage ~ part 12

The picture has something of this: veil, dress, costume, people, wear, crown, woman, traditional, fashion, decoration, princess, bride, portrait, wedding, festival, queen, style, ceremony.
Perhaps it’s a painting of a woman in a pink dress standing in front of a mirror with a feathered hat on her head and a fan in her hand.