Looking at the bottom two images, it looks to me like the slope of her face is wrong. In the painting, her chin recedes too far, compared to the photo. Her face seems to angle inward too much. See how features line up with each other with a plumb line.
As Mike suggested, use higher resolution photos, and put your photo reference next to your art. That makes it easier to see the differences.
Personally, I hate to have to resort to that, since I'm trying to learn to draw accurately by eye, but if you have a commission to save, pull out all the stops.
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