My issue with her face is that it hits the uncanny valley pretty hard for me because of the eyes and nose. If you move the eyes down a tiny bit and make her nose a little bigger she looks a lot better to me.
sometimes I think dismissive blanket judgments about people with anime avatars are unfair but then I see something like that "horse face" comment in this thread and think hmm maybe they're fine actually
Isn't that pretty much the reason though? It's to show her natural connection to the lifestream. Cloud has similar eyes but he was artificially injected with Mako instead of being naturally one with it.