This rectangle is the outcome of putting together all the half tones.
These half tones give out the illusion of shape. Notice how shadings can substantially
change a drawing. Notice how drawings on the left look bland and boring as it against
the drawings on the right.
Some Tips on Tones and Values
In shading, it is better to use a blunt pencil than a very sharp one.
Use B pencils since they are darker and will give enough depth in your drawings. Once
you start shading, pressure applied changes gradually since the shading must appear or
look even.
Make your strokes near to each other that it will be difficult to notice the different
strokes.
Do not over shade the drawing because it will be easier to add tones than remove them
by eraser.
Do not draw definite outlines when you want to shade because shading makes use of
light and dark to create form.