Caricature
"A picture, description, or imitation of a person or thing in which certain striking characteristics are exaggerated in order to create a comic or grotesque effect."
Watch Some Caricaturists at work
http://www.youtube.com/watch?v=kNPoi8Yuyeo
http://www.youtube.com/watch?v=WaDOia5bgPA
http://www.youtube.com/watch?v=VnxSOawHg10
http://www.youtube.com/watch?v=WaDOia5bgPA
http://www.youtube.com/watch?v=VnxSOawHg10