I use markers to get an idea of how the colors will look once in the game. Shading is mostly done by applying pastel colors. The basic structure is made with a 4H pencil, which sets up the layout and proportions of the drawings. Animation instructions and game related numbers are overlaid with red markers. This is great help when planning the direction of the whole scene.
Important dialog segments get added to the backgrounds and become part of the scenographic viewpoint. Plot descriptions that describe single scene parts are placed in the middle to create separation.