Portrait of a woman, aged sixteen, previously identified as Mary Fitzalan, Duchess of Norfolk Hans Eworth (Ewoutsz) (1520-1574)

The picture has something of this: dress, wear, royalty, traditional, portrait, costume, theater, jewelry, people, veil, woman, opera, gold, decoration, princess, retro.
Perhaps it’s a painting of a woman in a red dress with gold trimmings and a tiara, standing in front of a green curtained background.