Guillaume Coustou (after) ( 1677 - 1746 ) was a French painter. Guillaume Coustou (after) s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 239.51 USD for Marley in 2004 to 2313.57 USD for THE MARLY HORSES in 2017 , based on the size and medium of the artwork.