Getting a shot of someone deep in thought is very much like getting a picture of someone sleeping: it’s all about being in the right place at the right time without disturbing your subject. Then again, you could just have a statue pose for you.
Close up of The Thinker by Brian Hillegas
thinker by Petras Gagilas
A Little monk in the market by Sukanto Debnath
Vladi by Marko Milošević
Image by Danilo Arenas Ireijo
Sunset & the Thinker by Esparta Palma
Source: http://www.photographyblogger.net/16-meditative-pictures-of-thinkers/