Oswaldo Guayasamín ( 1919 - 1999 ) was an Ecuadorian painter. Oswaldo Guayasamín s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 27600 USD for Paisaje de Quito in 2003 to a remarkable record 605000 USD for El grito in 2005 , based on the size and medium of the artwork.