Willem Gillisz Kool ( 1608 - 1666 ) was a Dutch painter. Willem Gillisz Kool s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 3756.16 USD for Fisherfolk on the beach with sailing vessels beyond in 2006 to 15024.65 USD for Fisherfolk on the beach of Scheveningen in 2006 , based on the size and medium of the artwork.