Willem De Kooning (after) ( 1904 - 1997 ) was an American painter. Willem De Kooning (after) s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 600 USD for Spring Artist Exhibition in 2004 to 46875 USD for SITTING FIGURE (FROM THE LEDA AND THE SWAN SERIES) in 2012 , based on the size and medium of the artwork.