Her Dutch-language Wikipedia article is here.
From Wikimedia; spots and the longer vertical flaws were fixed with Photoshop.
The dark color or Maria Cornelia’s dress and the vertical lines of the dark boa reduce the impact of her wide-shouldered dress.
Keywords: 1829, van der Hulst, Marie Cornélie van Wassenaer Obdam, gravin en vrouwe van Wassenaar Lage en Twickel, van Wassenaer Obdam family, van Heeckeren family, Countess, Dutch, Lady-in-Waiting, Anna Paulowna, wavy coiffure, braided knotted bun, bandeau, earrings, necklace, fur boa, chemise, modesty piece, vee neckline, pleated bertha, epaulettes, gigot sleeves, waist band, vee waistline