William Sidney Cooper ( 1854 - 1927 ) was a British painter. William Sidney Cooper s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 554 USD for On the Stowe Kent (+ Cattle watering, smlr; 2 works) in 2002 to 9554.14 USD for Sheep by a tarn in 2006 , based on the size and medium of the artwork.