Blind Contour Drawing

Blind contour drawing is a method of drawing that requires a person to draw whatever they see without looking at their paper. They focus on the outline or "contour" and use one continuous line to draw without lifting their pencil to avoid confusion when drawing. An artist known as Ian Sklarsky uses this technique to create his works. He uses an ink pen to draw his subjects and later uses watercolor to add unique effects.

Sources : http://www.coolhunting.com/design/ina-sklarsky.php