First of all draw a circle.
Now draw these lines it'll help you to locate the area to draw eyes , ears, and mouth.
Now start drawing Obito's mouth beneath the circle.
Now draw Obito's hair above the circle. Just like you can see in the picture.
Now draw Ears , and eyes obito has sharp and almond like eyes just like every Uchiha.
Now draw nose and draw a curve line at the end of circle for Obito's mouths.