What I can see is that the hair-model is way too high; it should be close and a little bit larger.
My suggestion is that you start doing this with a simple object (Platonic perhaps), and a Hemisphere. Then adapt the Hemisphere to the Platonic object.
The idea is that you don’t start with something that needs to be correct. Something that you can mess up and no harm was done. It makes no sense that I do the same again, and you follow, only that you will feel the same problem again with the next character. There will be a new challenge. You need to get this into your muscle-memory. Doing it from a video clip is like painting by numbers, which trains the hand/brush coordination. Nothing else relevant. It must be yours able to perform it at any time. Then you can create freely.
Of course, I will send you an upload link, and I will have a look into it. But I know for sure, I really don’t do you a favor with that; it will set you rather back. If you want to make great videos, you need to do that with simple objects, then with more complicated things, and so one. I know you want to get it done. But I create here a dependency. I want that you feel confident and free to do it whenever you like.
I try to get a picture of any artist here and what is best for them. You know your self best, I hope. Patience, motivation, and ambition need to create a triangle than surrounds your vision. It should not be smaller.
So, have you followed the simple object set up, have you tried it, done it many times?
Anyway, if you do it or not, it is only in your very own interest. Do you want to grow big or get by?
Check your PM.