LIGHT SOURCE
Without a light source there will be no shadows, highlights, reflected light edges or tonal values. The light source creates shadows which indicate form, solidity, tonal values, surface contours and textures.
If you are right handed the light source should come from the upper left hand side, so you are not working in your own shadow. If left handed, this is reversed.
TONE
The more tonal contrast in a drawing, the more three-dimensional the drawing will appear. If there is no tone, which also creates the shadows and highlights, the drawing or painting will appear flat. Surface texture is indicated by tone, and the reflected light edge gives a solid form to the subject.
With no light source creating tonal values, a drawing will appear flat.
REFLECTED LIGHT…
