Observational drawings.
One of my favourite infant drawing lessons, great results every time.
Even pupils with the most basic of drawing skills produce exciting, detailed and well observed drawings. These examples were drawn by 4, 5 and 6 year olds. I love black pen drawings.
The children start off by drawing a large circle for the mouth. This seems to make them think differently about drawing a face, approaching it from a different aspect, it makes them listen to instructions and observe more closely. Although some still draw the nose and eyes within the confines of the mouth because it is a familiar face shape, most end up making really true representation of the subject.