This head of the Buddha, once framed by a halo and joined to a complete figure, would have been worshipped in a monastic shrine. The facial features and wavy hair show the Greek and Roman influences that arose through trade contacts with ancient Gandhara, an area now divided between Pakistan and Afghanistan.
On display in the Freer Sackler Museum, Smithsonian Museums. Washington DC
I messed up photos for the top of the head.