Shading involves drawing and shading exactly what you see without outlines or extra details, using directional shading that follows the form of the object with curved lines for rounded objects and straight lines for flat objects, creating edges where two values meet.
4. 1. Draw and shade exactly what you SEE, nothing more, nothing
less.
2. Use directional shading. Follow the form of the object you are
shading. Curved lines for rounded objects and straight lines for
flat objects.
3. NO OUTLINES!! Edges should be created where two values
meet.