With most good colour drawings a light source is always needed. From the right to left, from behind and front, it does not matter where the light source is coming from as long as your shading, of an object/image, corresponds with it. Shading is something that does not come naturally but with practice. As you keep at it you get better and better, so donít be disheartened if at first it does not work.
In this tutorial I will give you an idea of how you might want to achieve the clean style that some manga artists on RMD use. Some steps of this tutorial could also be used for still-life drawings. The only tools that are required for this style of drawing is the fill tool and the line tool.
This video captures shows the steps I take to draw a bug. Watch this video of me using the RMD Drawing Tool and I hope you learn something.
This is a video capture of me drawing Howl. It shows the techniques I used to create a detailed manga drawing using the line, fill and airbrush tools as well as using a guide layer.
This video is about the creation of light and dark tones used in a landscape only using the fill tool + airbrush and different transpenrancy settings. by watching this you can see how i create tone and shades in my work (not using the guide layer for this drawing)