Marquise de Pompadour by ? after de Latour (probably auctioned by Boris Wilnitsky)
This looks like
a copy of de Latour's 1755 portrait of the Marquise de Pompadour reading sheet
music.
Keywords: 1755, de Latour, Marquise de Pompadour, Marquise, French, mistress, Louis XV,
curly coiffure, square decolletage, modesty piece, revers, stomacher, bows en
échelle, three quarter length tight sleeves, ruching, engageantes, lace, vee
waistline, over-skirt