Pencil artists Bengtern use several techniques to present their vision. According to ehow.com The art of contour - or focusing on the shapes of things and black and white spaces - is particularly important, in which the artist strives to get the form down without lifting his pencil. Shading, or the ability to distinguish between light and shade, is the next major building block for the pencil artist to master--primarily by manipulating erasure marks with a blending stamp to achieve the right balance. The final task involves the addition of lines and textures to provide greater definition and realism. The manipulation of these techniques forms the basic elements of any pencil drawing, while helping to distinguish one artist's style from another.