The image was still up in Photoshop on the computer I used for the earlier comments, and at a glance I found that I should suggest that the shadow on the side of her cheek (our right, her left) is probably too dark. Likely more clumping of values in a photographic reference. And that dark value shape lying next to a much lighter value shape creates a fold or crease between the two areas, rather than the softer turning of the form that we "know" is there.
This effect varies between monitors, so you'll have to use your own judgment about what the painting "really" looks like, and whether this is in fact an issue.
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