Only takes one line to create perfection.
Jack Nicholson, Will Smith, Eddie Murphy, Johnny Depp, Samuel Jackson, Leonardo Dicaprio, Rowan Atkinson, Morgan Freeman are all hand drawn in a very special way. They are a type of contour drawing called a "Continuous line contour drawing'. It is done without picking your pencil off of the paper.
"A contour is the line which defines a form or edge - an outline. Contour drawing is the place where most beginners start, following the visible edges of a shape. The contour describes the outermost edges of a form, as well as dramatic changes of plane within the form. Put simply, a contour line drawing is an "outline drawing," that uses no shading."
"A contour drawing is done when the artist looks intently at the edges of an object, but rarely looks at the paper while the pencil moves. The goal of contour drawing is to make a line that is authentic and true to what you are actually seeing, and to train your hand to copy your eye's movement."
'Blind contour drawing' is when contour drawing is done without looking at the paper at all. It is a very interesting exercise that can be used to strengthen your artists skills.