This chart show different shades created with different pencils. The higher the number of the pencil e.g. : 6B the darker the shade.

Pencil shading tutorial What H or B pencil to use to get the right shade. Remember, the human eye can perceive 255 distinct levels of value- so add some RANGE to your density contrast, will ya!

Drawing and shading 3D shapes: value and form

Here is a tutorial I made on how to draw and shade shapes- A Cone, A Cylinder, a Sphere and a Cube. Anyone is welcome to use it to learn how to draw for personal and non-commercial purposes.