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Hi Rui,
I must agree that this is not an easy reference photo to use. I think you have to invent some shadow areas to emphasize the 3D forms.
You could make a broad contour along the coat, starting from her right cheek and down to the button of the painting, indicating that the light comes from a point a little more left than it actually does.
Likewise you could adjust the shadow areas on her left cheek and under the nose.
You will see what works. It does not need to be much to work.
Allan
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