Gwen John ( 1876 - 1939 ) was a French painter. Gwen John s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 6220.14 USD for La Boutique de Madame Gaiffa in 2015 to 37320.86 USD for La Retraite, sketchbook, March 1928 in 2015 , based on the size and medium of the artwork.