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It's always very risky to combine parts of a face from one shot with parts from another. It can make it almost impossible to nail a likeness.
The shape and angle of her mouth is related to everything else on her face. The photo you posted as the main reference with the asymmetrical smile shows all her other features at a certain angle.
Changing her mouth affects the shape of her chin, nose, naso-labial folds, cheeks, eyes, everything. As Chuck pointed out, the reference of her face is slightly on an angle but you have painted her straight on.
You've made the job much tougher on yourself than it needs to be. In the next portrait you do you'll find it much easier to pick one photo to go with for the whole face.
This was done in watercolor, wasn't it? Amazing!
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