Usage patterns
見た目が〈形容詞〉to look (a certain way)
This cake looks really beautiful.
見た目で〈動詞〉to judge/decide based on appearance
You shouldn't judge people by their appearance.
見た目とは違って〈事〉contrary to how it looks
Contrary to how it looks, this insect isn't dangerous at all.
見た目ほど〈形容詞〉ないnot as ~ as it looks
This dish isn't as spicy as it looks.
〈人〉が見た目を気にするfor someone to be concerned about their appearance
Recently, young men have also become concerned about their appearance.