Gerard Thomas (after) ( 1663 - 1720 ) was a Flemish painter. Gerard Thomas (after) s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 2662.23 USD for An art collector in his study in 2005 to 28800 USD for An allegory of painting and sculpture in 2006 , based on the size and medium of the artwork.