Ok, so its the eyes, your actually very good at drawing them (you don't fall into the trap of drawing all the iris which makes people look like a complete psychopath 😂)    but there is one thing that very slightly out and once you know it, your going make it look great next time. The space between your eyes is about the same distance as an eye itself. At the end of the day it's a golden proportion thing there is tiny amount of variation between people some a tiny bit more, some a tiny bit less but it's usually about a eye width. You can think of it as the space for your 3rd eye 😁 

Other things that make drawing a face easy are knowing in from the side the bottom of your earlobes line up with your mouth. Looks like you got that about right 🙂 . 

The edge of peoples mouths generally end where the pupils of the eye in a relaxed expression sometimes that can be useful to know

Also as a fun body proportion thing  your elbow to your wrist is pretty much the same length as your foot. 🙂 

Drawing is a waist a time though you cant learn anything from it 😉🤗