Theodor Guillery ( 1900 - 1976 ) was a German painter. Theodor Guillery s works have been put up for auction numerous times, with realized prices varying from 251.15 USD for Sunflowers in 2003 to 350.23 USD for Venedig - Fischerboote vor San Giorgio Maggiore in 2005 , based on the size and medium of the artwork.