I really must practice imagining the entire sketch when I begin my blind drawing. This means I must create a mental picture of the sketchbook surface on which my hand will trace the outline of the portrait subject. This is difficult, since I place the point of my pen at one place on the outline and try to skate it around the entire contour, while looking at the subject.

I usually work in sections. In the sketch below I began with the foot and worked myself up to the man’s bottom (or tush).I worked that line across to trace the bottom of his jacket.  The top half of the man is very much larger than the bottom. The original leg and tush segment is in correct proportion, however that tush is the tush of a very small man, not the large man sitting on it in this sketch.

Man with Skinny Tush
Pen and Ink Sketch
8″X10″ 111# Moleskin Journal