Comtesse Daru Jacques-Louis David (1748-1825)

The picture has something of this: veil, portrait, people, crown, jewelry, necklace, royalty, wear, woman, queen, dress, monarch, princess, costume, dancer, tiara.
Perhaps it’s a painting of a woman sitting in a chair wearing a white dress with a tiara on her head and a green beaded necklace on her neck.