Btw this is one of the most difficult angles to do if the head. Some quick tips: the bottom of the ear lines up with the middle of the mouth; too with the browbone. Try and draw the pupils and get a sense of the eyeball; eyelids cover most of the eyeball, but the eye socket spaced brow and cheek bones. The ear is in the middle between the front and back of head. Good tutorial here on 3/4 view https://shop.zenartsupplies.co/blogs/toolkit/how-to-draw-3-4-view-face-step-by-step