From Wikimedia; spots throughout image removed with Photoshop by gogm.
Countess Sheremeteva is dressed much as she was for her 1897 photo in somber black with a high neckline.
Keywords: 1898, Bogdanov-Belsky, Ekaterina Pavlovna Sheremeteva, Countess E. P. Sheremeteva, Vyazemsky family, Sheremetev family, Countess, Russian, straight coiffure, high enclosing neckline, zouave jacket, long leg-o-mutton sleeves, cuffs, close skirt, pin, bracelets