First we'll tackle 'Structure'We'll start with our working lines. A good start is a circle (diagram.1). So draw a circle.Now draw a line where you want the center of the face (i'm going to call it the "noseline") down the middle, I've offset mine to the right and curved it around as if it were a ball, but instead of wrapping around the bottom, I've continued straight down so the noseline drops to around where the chin should be.Then draw a second line around the center, like the equator, for your eyeline.Now lines from the eyeline where the ears go, about halfway around the ball (diagram.2)Okay, draw rough outlines of ears from the earline back. Now add a jaw from just below the ear to the chin point.Note: You should be able to see the proper shape by now so if you drew your chin point too high or too low you'll probably notice it and can correct it. Now do the same on the other side of the face: from earline to the chin.I'm not exactly sure how I put the eyemarks in, I more or less guessed, but take a look at diagram.3 and guess too.Now you should have something that looks like diagram.3.