Marianne Loir (after) ( 1715 - 1769 ) was a French painter. Marianne Loir (after) s works have been put up for auction numerous times, with realized prices varying from 1821.14 USD for Portrait d in 2004 to 6250 USD for Portrait of a lady as Venus with her son as Cupid in 2011 , based on the size and medium of the artwork.