The plan for a three quarter view face uses the same method of showing where the centre line of the face is, and the eye line. First draw the circle, then the centre line of the face (you'll see that moving the line futher to the side will make the character be facing more in that direction.) Next, draw the eyeline (note that the line will have to be rounded and on a slight angle).
 
 

Using the plan to determine where the chin and cheek bone will be, draw in the shape of the face. The ear's middle should be at the eyeline. 
 
 

Draw the face using the method from the first lesson, but remember to make the features on the side furthest away narrower.  Notice that in my demonstration the eye on the right side of the face is about twice as far away from the centre line than the left side is, and that the centre line marks about the one third mark on the face. So if the line was one quarter of the way across the face, the right eye would be three times the distance from the centre line as the left. (I hope some of you out there understood that...) The nose also curves towards the left side of the pic.

The fringe when viewed from an angle tends to towards the side furthest away. Draw the furthest spike sticking out a little from the forehead. Goten's hair becomes more bunched up at the end furthest away, and appears to be shorter, while the closest side looks longer than when viewed straight on.
 

Then erase the plan and you're done!