So-called portrait of Maria Luisa of Spain, Grand Duchess of Tuscany

So-called portrait Maria Luisa of Spain (1745-1792), but it's probably a portrait of her sister-in-law Archduchess Maria Amalia of Austria (1746-1804)
Identification made by the uploader based on the comparison with a miniature sold by Wilnitsky (see image below)
Italiano: "Ritratto di Maria Luisa di Borbone. ritratto di donna", probabilmente Maria Amalia d'Asburgo-Lorena, erroneamente identificata con Maria Luisa di Borbone-Spagna