The basic shape of a face is an oval. Not too exciting, but it's simple. A good way to start. You don't have to make it perfect. Use many lines not just one. Notice how your hand can only bend certain ways. Maybe you need to spin your page upside down or imagine you are making giant parenthesis.
You know how right-handed people and left-handed people have different writing strokes? It's the same when drawing. You'll probably have an easier time making one side of the oval than making the other.