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No, they often look perfectly normal from a distance.
For context, the girl in the picture just lost a game.
She looks happy, but then it zooms to her eyes and you understand she's anything but.
Or this one, in the third and fourth panels.
The second one I would describe more as a Slasher Smile than an expression of hate. Psychotic Smirk is a similar but more subtle expression.
Edited by Scorpion451

A manga trope where a character with Eyes Always Shut (or whose face currently has a closed-eyes look) gets a zoom on their face, revealing that their eyes are just barely open as an expression of the immense rage/hatred they're feeling.