The Countess of Rocksavage (Sybil Sassoon) John Singer Sargent (1856-1925)

The picture has something of this: woman, people, portrait, baroque, saint, nude, Renaissance, gold, wear, vintage, wig, antique, veil.
Perhaps it’s a painting of a woman in a yellow dress with a shawl around her neck and hands on her chest, looking to the left of the viewer.