Gwen (mary) John ( 1876 - 1939 ) was a British painter. Gwen (mary) John s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 2994.15 USD for BOY WEARING A CAP in 2002 to 132676.02 USD for THE CONVALESCENT in 2013 , based on the size and medium of the artwork.