I have found there are Lambertenghi and Serbelloni families, the Serbellonis being Lombardian aristocrats.
From sirbecweb.partnertecnologico.it; the image was approximately doubled in size to 35.93 cm high at 28.35 pixels per cm.
If the image is made much lighter, the upturned seam beneath her bust emerges and there is no evidence of a pleated bodice. Combs are fashionable in 1811.
Keywords: 1811, Appiani, Andrea Maria Lambertenghi Serbelloni, Lambertenghi family, Serbelloni family, Countess, Italian, straight coiffure, curly bun, hair jewelry, comb, square décolletage, modesty piece, quarter length full sleeves, Empire waistline, bows, close skirt