Gabriel Von Hackl ( 1843 - 1926 ) was a German painter. Gabriel Von Hackl s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 512.95 USD for Erzherzog Josef von Österreich besucht das Invalidenhaus in 2005 to 6580.98 USD for The child prodigy in 2006 , based on the size and medium of the artwork.