Newberry Art Tutorials
Portrait Triangulation Time-Lapse 24 sec. One of the great drawing tools is triangulation. You fix two points, for example, the bottom of the chin and an earlobe, from these two points you find the angle of a third point. You now have three points of reference. Using any of the two points you established you find another third point. It resembles something like a star chart.
When the axis lines are erased you end up with a very natural looking object.