Adolf Hartmann ( 1900 - 1972 ) was a German painter. Adolf Hartmann s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 11.58 USD for Selbstportrait in 2005 to 3332.54 USD for Bildnis der Mutter des Künstlers in 2006 , based on the size and medium of the artwork.