Hi, love your work.
I don't have any artistic talent myself, but I do know optics.
When you have an external bright light source, you get a sharp reflection on the transparent cornea. The light then bends down and illuminates the iris directly opposite the reflection. If you use the blackest black paint for the pupil, you can get a scarily real looking eye.
Your dolls are amazing, I heard that Disney is making a Limited Edition Esmeralda Doll, I can’t wait for it and I’m excited for it along with a Phoebus and hopefully Frollo Dolls.