The following four photographs are all courtesy of Artnet.com. After one of them, The Whiz Kids, I've interjected a brief comment in the interests of clarity. After three of them, I've identified the Gallery where copies may be purchased.
The Whiz Kids (1996), by Artnet and Annie Leibovitz
From left to right, Scorcese, Spielberg, Coppola, and Lucas. Currently for sale at the Fahey/Klein Gallery.
The Roots, Philadelphia (2000), by Artnet and Annie Leibovitz
Currently for sale at the Edwynn Houk Gallery.
Queen Elizabeth II (2007), by Annie Leibovitz and Artnet
I couldn't ascertain the name of a gallery where copies of QE-II are for sale.
Willie Nelson at Luck Ranch (2001), by Artnet and Annie Leibovitz
Currently for sale at the Fahey/Klein Gallery.