Illustration - Storyboards - Concept Art - Character design
  1. rorrim
  2. Managing Director
  3. Managing Director
  4. Managing Director
These super quick sketches help map out a scene for film or animation before production, in order to create a cohesive idea of what happens in the scene. It might be accompanied by a mood board with a general look and feel and some basic contextual references.
Some more high-concept genres require more complete storyboards, to the point where they resemble comics.
One should be able to read the storyboard, and know exactly how the scene plays out.