Step 3: The Face!
This part is a little hard to explain so I have pictures to detail the processes as well. I have estimated the eyes are about 2" in diameter. So take that 2" round object and sketch it onto the copy paper. In the LEGO man diagram, the eyes are the same distance apart (end to end) as the stub on top of the head, about 6". Mark the distance but don't draw the other circle yet. Take the paper and fold it so the line you marked matches with the other eye and sketch the circle on this side. Unfold it and you should be able to see the mark you made on the other side, redraw that circle on the other side. This is to make sure the eyes are level with each other, we don't want to make a lazy eye LEGO man.
The smile is simple but difficult to recreate. The "peaks" of the smile is 2" from the bottom of each eye, mark each point. I found that a 8" round bowl creates the right radius of the smile. Align the bowl with each mark and connect the dots. Now mark two more points one more inch below each peak and connect the dots once again with the bowl. Rounding the ends of the smile was done by free hand, do your best to replicate the ends and use a pencil so you can perfect it before you begin the surgery. Mr. frob has suggested using a compass for the ends. A 1/2" radius circle will give you the right curve to connect the end points of the smile.