From telegrafua.com/social/12548/print/.jpg; this is the largest available size of this image.
This is a full length version of the last image and it shows she wears a pleated bodice.
Keywords: 1812, Gérard, Marie Walewska, Maria Łączyńska, Maria Laczynska, Countess Walewska, Łączyński family, Walewski family, Countess, mistress, Napoléon Bonaparte, curly coiffure, jeweled floral headdress, pleated bodice, sweetheart neckline, neckline ruff, quarter length close sleeves jeweled belt, Empire waistline, close skirt, train, necklace, earrings, shoes, wrap