I have not seen the artist identified, but the hair jewelry and background drapery are consistent with Schönheitengallerie portraits. She did return to Europe in 1831 while this image is from around 1840.
This particular version of the image is from internetstones.com; I added as much lightness as I could to bring out details in the vast black areas of the image. I re-sized the image, enlarging it to 25.4 cm (10-inches) at 28.35 pixels/cm.
Amelie von Leuchtenberg wears an Early Victorian dress with a pleated bodice and flared sleeves that resemble Russian sleeves.
Keywords: Amelie Leuchtenberg, Princess, Empress, Beauharnais family, Bragança family, hurluberlu coiffure, knotted bun, hair jewelry, Ferroniere, off shoulder vee neckline, modesty piece, pleated bodice, elbow length flared sleeves, fur, necklace, clasps