First of all draw a big circle.
Now draw these lines it'll help you to locate the area to draw eyes, nose, ear and mouth.
Now Start drawing Yona's face beneath the circle.
Now draw these two lines for her neck.
Now draw her clothes as you can see in the picture above.
Now draw her hair. She has curly long hair. Her hair is falling down from both side of her eyes and between the eyes. And draw rest of the hair as well.