Varying Techniques and Materials

To start with, try out this loose-line technique, in which there is very little in the way of careful tone or sometimes none at all. The questing, wobbling line, which almost looks as though the point of the pencil never leaves the paper, is a very expressive medium for quickly and elegantly starting the form of the objects it is describing. 

Shown here is the more careful and deliberate method of drawing quite fine and precise outlines and then carefully shading in the tone until it graduates from dark to light with a great subtlety. For this method, the pencil has to be kept finely sharpened at the start, but allowed to become softly blunt when shading.More on my art  tipsblog