William Matthew Prior ( 1806 - 1873 ) was an American painter. William Matthew Prior s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 3250 USD for YOUNG CHILD IN BLUE WITH RIDING CROP. in 2004 to 112500 USD for PORTRAIT OF A YOUNG GIRL IN A PINK DRESS HOLDING ROSES in 2018 , based on the size and medium of the artwork.