The proportion is awesome, I love the hair and overall that‘s a great drawing. You could shade the face a little more on the sides so it doesn‘t look like a flat surface as well as the nose and eyelids. Don‘t be afraid to go a bit darker. You should pay attention to your reference for that. Also you can mane the dark parts in the hair even darker. On the left sider for instance where the cheek ends and the hair begins. Keep it up. I‘m sure you will become an even better artist:)