Oswald Poreau ( 1877 - 1955 ) was a Belgian painter. Oswald Poreau s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 303.98 USD for Elégante à l`ombrelle. in 2004 to 2770.99 USD for Zomerdag met picknicktafel aan een vijver in 2010 , based on the size and medium of the artwork.