Where do artists get there inspiration ?

Art style's are forever changing, I love Mark bradord (a piece of he's art is displayed above
http://caleblarsen.com/uploaded_images/1742-7622-3-15-1-761797.JPEG).
I'd love to see where he's influences root from and if he is a fan of old style art or modern art.
Sometime's you can be suprised ?

http://www.pbs.org/art21/artists/bradford/index.html

Some information on Mark Bradford.
By Stephanie Correll