Her genealogical sketch is here.
From pinterest.com/carycaiv/polish-nobility-in-art/; filled in shadows.
This Maria Potocka is somberly dressed, including a black lace wrap. Her white lace collar and four strands of pearls punctuate the darkness.
Keywords: 1859, Winterhalter, Maria Sanguszkowa, Maria Potocka (1830-1903), Sanguszkow family, Potocki family, Princess, Countess, Russian, straight coiffure, high neckline, lace collar, lace wrap, draped necklace, earrings