Mrs. William George Raphael (Margherita Goldsmid) John Singer Sargent (1856-1925)

The picture has something of this: people, veil, portrait, dress, wear, woman, princess, wedding, queen, bride, model, costume, jewelry, fashion, baroque, girl.
Perhaps it’s a painting of a woman in a white dress sitting in a chair with her hand on her chin and a book on a table in front of her.