In my unofficial book of Yandere rules, it is law that every Yan-loli has
3 distinctive forms upon entering Yandere Mode:

Form 1: Happy but Creepy- Essentially the "smile with a chop" look. The least dangerous form of Yandere mode.

Form 2: The Meaner Beaner- This form includes more screaming and maybe a pissed off scrunchy face. This is usually the Yandere mode that is just over the comfort zone of most.

Form 3: The Sh*t Rocket- This is the point when the Yan-loli has completely lost it, is probably not speaking any normal language, and her face is completely out of whack. The is the Yandere mode that makes you poop.

(too lazy to color~ :P)