"If I didn't know it already, I wouldn't discern that the gallery below is made up of drawings. Yes! They are NOT photographs. Vector drawings using gradient mesh to be specific. Except for Bert Monroy, all of the vector art displayed here are 100% made from Adobe Illustrator."
They are indeed very talented graphic artists, that's for sure!
Source: Basangpanaginip (some images NSFW)
Design Interior: Optical Illusions In Reality
Dirt Car Art
Fictional Surreal Art By Jacek Yerka