>>9966762They were always clearly meant to be cute girls. Their outfits are designed to be sexy, with the midriff and the shorts. Majority of artwork of them has them looking cute or pretty vs that one character select screen with the cartoonishly exaggerated features.
Simply put, because they're female characters, SNK wants them to look cute. Male characters can look cool or funner though a lot of artwork has them looking like pretty handsome dudes too.