Johann Wenzel Bergl ( 1718 - 1789 ) was an Austrian painter. Johann Wenzel Bergl s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 934.1 USD for Bildnis Josephine von Grafern in 2005 to 1587.76 USD for Entwurf für ein Wandfresko in 2009 , based on the size and medium of the artwork.