It's a portrait of Cave Johnson, founder of Aperture Science.

Just out of curiosity... what is that portrait you have that's set as your profile picture?

hey if u wanna join our left4dead2 custom games u should probably download these maps, we are playing these atm:
-City 17
-Arena of the Dead
-Tower (by RabidMonkey)
-Fort Noesis
=25 to Life
-Umbrella
-DeadCity 2 Campaign
-& probably Left 4 Cake 2
they can all be found @ left4deadmaps.com or (l4dmaps.com) in the left 4 dead 2 section hope to see u in game.

Thanks man