There are many different types of anime and different art styles within it. Anime often uses different types of styles in their show, to represent how a character feels, or what that caracter is doing. Different art syles may include the screen to look like it was drawn, or to have the colors turn black and white with blunt edges.
Embarrassed face found on Anime Expressions by Chris Kincaid on Febuary 12, 2011. This is the use of Fair Use.
Sailor Moon image found on Itunes This is the use of Fair Use.