François Duquesnoy ( 1594 - 1643 ) was a Flemish painter. François Duquesnoy s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 520.36 USD for Study of a sleeping infant viewed from the left side in 2003 to 13511.67 USD for La Vergine in 2005 , based on the size and medium of the artwork.