Wikipedia dates this to 1820, but the vee waistline and dual sleeves make it more likely that this portrait of Sofia Kiselyova is from 1830.
Keywords: Oleshkevich, Sofia Potocki, Sofia Kiselyova, Potocki family, Kiseleff family, Countess, Russian, hurluberlu coiffure, bun, bateau neckline, dual upper puffed sleeves, vee waistline, full skirt, necklace, bracelets, wrap, fringe