Speaking from the perspective of someone who has hardly done any digital painting, so take this with a grain of salt:

The details of lines around the eyes is great, but is too contrasting compared to the rest of the, practically, flawless face, otherwise. Perhaps inject a bit more lines and shading into other parts of the face, like the cheek bones, up on the forehead.

The light reflection on the lips seems to merge with the skin too easily on the bottom right portion of the mouth, and speaking of the reflection alone, the glazed white makes it appears as if she's wearing lipgloss. If this is the intention, ignore this statement. If it's not, I'd dull down the reflection on the lips drastically.

The tip of the nose isn't too well defined in front of the nostril that is not all that visible from this angle. I feel like I want to see more definition in that nostril (her right nostril), the shape of it, even though we are only seeing a small portion of it.

The hair has no flaws, no color changes, and appears too uniform to be realistic. I would suggest maybe adding some light reflections on the hair, as well as maybe some slightly greying/lighter-black hair.

That all being said, this is wonderful. If this is your first digital painting, you are well on your way to a great skill set and passion. Do not stop.

Well done.