Okay I know that this first step may seem a little complex or confusing, but if you follow what I say then you will have no problems defeating this task. What you will do first is draw out a circle for the shape of the skull and then you will add the lining of the teeth and mouth as seen. Next begin sketching out the lining of the eye sockets and then the lines for the shaping of the flames. These lines look like pointed wavy shapes.