I wonder why Alice's eyes are yellow. PC-98 eye color?

I had to look it up and Alice's eye color is... remarkably inconsistent. It appears as yellow in Mystic Square, then sort of greenish-yellow in Perfect Cherry Blossom, then orange-ish in Imperishable Night (although I'm not sure if that's an art thing or a plot thing), then green-ish in SWR and Soku. Alice only started to be depicted with blue eyes in some of the print works like Grimoire of Marisa.

So what I can tell the answer to Alice's eyes being yellow is "you can draw her with pretty much any eye color and it'd be correct at some point or another"

They're also yellow in her fighting game cut-ins, despite the sprites having them more green.

Maybe the Seven-Colored Puppeteer can have them in any color she wants.