William Louis Sonntag (after) ( 1822 - 1900 ) was an American painter. William Louis Sonntag (after) s works have been put up for auction numerous times, with realized prices varying from 2350 USD for River Valley Landscape in 2004 to 2500 USD for River landscape with distant mountains and a lone figure looking down on a crowd of people surrounding an American flag in 2014 , based on the size an