What is Tonal Drawing?
Tone of any object is assessed from how light or dark it is be it a bird or a mountain. Now, to differentiate between two objects that are drawn if one is light and the other darker, your eyes will easily perceive the difference. This variation of light and dark is signified by variation in tone.
Tonal drawing is the variation of black to grey that is given to a drawing on paper usually with a pencil.
Tonal Drawing is a recent development that has somewhat emerged from linear drawing and a sketch with tonal drawing will emphatically portray more of light and dark shading rather than thin edges and lines of the image.
So, simply put Tonal drawing is the art of gradual increase or decrease from light to dark from one part of the drawing to another.
Colored pencils, crayons, charcoal and chalk can also be used besides pencil for Tonal drawing.