The eyebrow shape, the mouth shape and color, as well as the cheek bone shape do not match the photo. The eyebrow shape in the photo is much more defined and pointed, her cheek bones sit higher than how you have them, and her mouth doesn't turn upwards at the corner like how you have it. In fact, it's the opposite where her upper lip is more convex and her bottom lip has less of a curve than how you have it. Also the skin tones do not match. I realize that you might have been trying to do some color correcting due to the different light sources in the photo and the painting but even in the photo you can tell that she still has some yellow and green tones in her skin so try to put those in there.
I would also suggest that you have a defined light source and work on defining your edges a little better. I hope this helps!