It also seems as if the face in the painting is not wide enough, though that could appear to be the case if you photographed the painting at a slight angle.
Can you post the whole body reference photo so I can see what she looked like before you "straightened her up a little bit"? I don't think you need to repaint the whole thing. You just need to keep the features of the face in alignment with whatever axis of the head you're using.
Of course, lots of "straightening up" can throw off your light and shadow areas from what they would naturally be, but I don't think that's the problem here.
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