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Hi Andrea,
Welcome to the Forum! Now that Steven has given you an extensive guide on how to improve this head, I have a more radical idea - get rid of this reference photo and use another one. (The photo to our left is better, but maybe not the best one you have).
The photo you're using is not quite a profile and not quite a three-quarter head. The tangent point between the cheek on our left and the tip of her nose is a clue that this is going to be a more difficult angle to "nail". I love that little turned up nose and if this were my commission I'd try to find an angle that catches some shadow to define it.
If you have a thin paint layer it's not difficult to start over on a new head. I'd apply a thin layer of medium over the whole head and start over (some people use retouch varnish, which I personally don't like to use).
Meanwhile, this is a nice composition. I like the idea of showing siblings doing things together. And such a big painting! Good for you for pulling this off.
Best wishes,
Linda
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