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Beth, you'll work this out as you always do, but just in passing by and looking at the side-by-side images of the mother, I think that the somewhat "disapproving" look in the painting comes from a subtle but significant change in the shape of the upper lip.
From the middle of the lip to the the corner of the mouth on our right, the painting's version rather rises in a convex arc that presents somewhat of a "sneering" look, and the lip shape and color remain very strong right out to the corner of the mouth. That, coupled with the slightly too-strong definition in the small part of the lip to our left of middle, creates kind of a "beaked" lip. In the photo, I see a more level or even slightly concave edge, with the mouth features softening substantially as we approach the corner of the mouth on our right and also immediately as we move to our left from the center of the upper lip.
While here, I'll just note that I think I'd lower the values (no matter what the photo "says") on the neck, especially below the chin, as hitting that area with light exaggerates a bit the fleshiness in that area, in a kind of unattractive way. To the same effect, watch the neckline of the shirt. In the photo it begins to level out and rise just under the chin. In the painting, this turn doesn't begin until somewhere under the temple. That's contributing too to the "fleshy" look that, while there to some extent in nature, is being accentuated rather than downplayed in the painting.
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