Otto Poertzel ( 1876 - 1963 ) was a German painter. Otto Poertzel s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 733.92 USD for An Olympic athlete in 2004 to 22754.85 USD for Schmetterings-Tänzerinnen in 2008 , based on the size and medium of the artwork.