William Penhallow Henderson ( 1877 - 1943 ) was an American painter. William Penhallow Henderson s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 999 USD for Waiting (Woman in Blue). in 2004 to 4750 USD for Casa Lopez - Camino Del Monte Sol in 2013 , based on the size and medium of the artwork.