Constant David Ludovic Artz ( 1870 - 1951 ) was a Dutch painter. Constant David Ludovic Artz s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 2579.51 USD for DUCK WITH HER DUCKLINGS ON THE RIVERBANK in 2003 to 6622.29 USD for Ducklings on a sunlit riverbank in 2008 , based on the size and medium of the artwork.