Sebastian Horsley / Marcus A Horsley ( 1962 - 2010 ) was a British painter. Sebastian Horsley / Marcus A Horsley s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 265.29 USD for Vortex in 2015 to 746.12 USD for Crucifixion in 2015 , based on the size and medium of the artwork.