Gustave Claude Etienne Courtois ( 1853 - 1924 ) was a French painter. Gustave Claude Etienne Courtois s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 2413.14 USD for PORTRAIT OF MADAME D in 2004 to 7348.62 USD for Abendhimmel über Paris. in 2014 , based on the size and medium of the artwork.