This is 2D not 3D. Realism does not apply
But seriously, it is their art style. Each country that produce their comic will have their own common art style. If the art is too realistic, people will rather watch a live action than animation. Another reason is big eyes is a physical attractiveness in some part of Asia. Japanese would do not have big eyes like other races express this physical attractiveness in anime.
But yeah, big eyes needs to be done right sometimes. I remember watching a certain mechan anime where the eyes are so big the kind of reminds me aliens with ahir.
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