Marble portrait head of a Ptolemaic ruler, perhaps Apion, King of Cyrene.
This model was made with the @micropasts project providing the photomasking. Model by Daniel Pett, Nikon D5100 and Photoscan. (Poor lighting conditions and close to the wall.)
British Museum collection online: http://www.britishmuseum.org/system_pages/beta_collection_introduction/beta_collection_object_details.aspx?objectId=437275&partId=1&searchText=GAA33028&page=1