Caricature:
 A grotesque likeness of striking characteristics in persons or things.


Example:


Explanation:
Charles Dickinson was known for creating caricatures. The purpose of them was to create something that emphasized or exaggerated a certain aspect. In this picture he emphasized his ears, nose, and hair. This is so he can show the reality of things and not hide behind the flaws, like many people tend to do.  Another purpose is it adds to the characterization of him that is seen by the reader, and in this case... the viewer. Caricatures can also be seen in his books, for example Great Expectations.