Robert Dunkarton ( 1744 - 1810 ) was a British painter. Robert Dunkarton s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 42.39 USD for Mary, Queen of Scots and Henry Stuart, Lord Darnley, pub. Samuel Woodburn in 2005 to 208.9 USD for The Night-Blooming Cereus in 2017 , based on the size and medium of the artwork.