Mrs Th Petersen, née Roepstorff Christen Schiellerup Købke (1810-1848)

The picture has something of this: people, wear, necklace, portrait, woman, jewelry, dress, fashion, jacket, queen, music, royalty, skirt, facial expression, lace, opera.
Perhaps it’s a close up of a painting of a woman wearing a brown dress with a gold chain around her neck and a cross necklace on her left shoulder.