Johannes Jacobus Hendricus van Leeuwen . Aliases: Joop van Leeuwen ( 1962 - ) is a Dutch painter. Johannes Jacobus Hendricus van Leeuwen s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 334.08 USD for Children at the beach in 2006 to 2125 USD for A Day at the Beach in 2010 , based on the size and medium of the artwork.