Mildred Valley Thornton ( 1890 - 1967 ) was a Canadian painter. Mildred Valley Thornton s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 3378.38 USD for ARRIVING AT THE POTLATCH in 2004 to 6462 USD for Mountains and Sea/A British Columbia Coastal Scene in 2006 , based on the size and medium of the artwork.