From Wikimedia.
This is a print of Elizaveta Markovna Olenina based on the portrait seen in the last image.
Keywords: 1791, Borovikovsky, Elizaveta Markovna Olenina, Poltoratsky family, Olenin family, Princess, Russian, bouffant coiffure, bateau neckline, lace bertha, bows, close sleeves, cuffs, waist band, natural high waistline, full skirt, chemise à la reine