Friedrich Muller ( 1749 - 1825 ) was a German painter. Friedrich Muller s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 323.54 USD for Köpfe von Ziege, Esel und Lamm in 2005 to 639.34 USD for Ziegen- und Hundeköpfe.1770 in 2009 , based on the size and medium of the artwork.