Remember her? One of National Geographics most famous covers, with those haunting green eyes. The photo is by one of my favorite photographers Steve McCurry. Slate has a wonderful interactive essay, The Aesthetic Hunter, on his photographs here.
In stark contrast to McCurry's brilliantly rich and vivid style are the pictures by my other absolutely favorite photographer, the great Henri Cartier-Bresson. He is single handedly responsible for all the black and white postcards that decorate the door of my cupboard.
The potrait here is of the brilliant Albert Camus (whose L'Étranger i am re-reading right now). The Washington Post has an excellent gallery of some of Cartier-Bresson's other potraits here.