Wikipedia's compilation of Schonheitengallerie has this image of Maximiliane Borzaga, a girl from the middle class, and there isn't a better one on the Internet.
Maximiliane wears a curly coiffure suitable for 1827 while her dress has a high neckline closed by a triangular lace collar.
Keywords: 1827, Stieler, German, curly coiffure, ribbon headdress, high neckline, collar, lace, earrings