Janice Sylvia Brock ( 1900 - ) is a British painter. Janice Sylvia Brock s works have been put up for auction numerous times, with realized prices varying from 71.83 USD for Waterbourne in 2010 to 113.42 USD for 'Anemones' and 'Yellow Tulips' in 2010 , based on the size and medium of the artwork.