by the way how can i make her eyes look more realistic
Go closer/zoom in and add veins and iris, etc., so all the fine details that are currently missing, use references for that.
If you need sources:
Do not forget to put the source link for a reference picture and if possible to credit the creator(s) of the reference picture(s) used if you want to post them here too, next to your picture, because that is a requirement by our rules.
In case you have an account with DeviantArt, you may want to use these tutorials, or the “cheat-brushes” supporting your endeavor in painting more realistic eyes:
https://www.deviantart.com/anastasia-berry/art/Iris-Tutorial-779738583
https://www.deviantart.com/anastasia-berry/art/Iris-Tutorial-860490406
https://www.deviantart.com/seraphineblackheart/art/Iris-Brushes-for-GIMP-and-Photoshop-558450295
https://www.deviantart.com/redheadstock/art/Eyebrows-Photoshop-and-GIMP-Brushes-498327642
https://www.deviantart.com/redheadstock/art/Catchlights-Photoshop-and-GIMP-Brushes-794259292
https://www.deviantart.com/redheadstock/art/Eyelashes-Photoshop-and-GIMP-Brushes-60583855
https://www.deviantart.com/redheadstock/art/Iris-Parts-Eyes-Photoshop-and-GIMP-Brushes-536708564
Michelist
Add/Edit: By the way, a registration with them may be worth the effort, but be aware of posting your own artworks on that platform if you don’t want to throw it away, you better don’t post it there (is my opinion) …
Thank you for helping me out and for all the links 
You’re Welcome!
Michelist