The right-hand photo shows the title tile. It's at the southwest end of the tunnel. (As always, you can click on it for a larger view.)
The Tucson Portrait Project took the photos, and the murals are appearing one by one. Want to find someone? Type their first name into the search box at tucsonportraitproject.com. Then choose a face from the group of images you get to see a larger version and the person's name, as well as which of the panels you'll find it on.
You can see some of the photographer's favorite portraits and the artist statement on the Conrad Wilde Gallery page about the project.
Update (July 28, 2019): Those last two links are broken, but we've left them here for historical reasons. Unfortunately, the Project was never finished.