Cross contour drawing exercises are great for helping strengthen your observational muscles. And when you start shading your mark-making will be that much more believable as a result. Watch the video below for some cross-contour exercises that you can have a go at today.
This is a really good example for the element of line, because your eyes have to follow the line down in order to see the faces drawn into it. This piece of art is also a very good example of a Continuous Contour Line Drawing because it is only one line drawn into all three of the faces. I was drawn to this image because at first I thought it was just a scribble, but when I payed closer attention I saw that it created three faces.