Your eyebrows show your emotions more than any other part of your face.
You can tell what a person is feeling by looking at their eyebrows first and foremost.
この場合、次のような言い方ができますよ。
ーYour eyebrows show your emotions more than any other part of your face.
「眉毛は顔の他のどのパーツよりも感情が現れる」
Your eyebrows show your emotions を使って表現すると良いでしょう。
ーYou can tell what a person is feeling by looking at their eyebrows first and foremost.
「何よりもまず、眉毛を見ることで人がどんな感情かがわかる」
このような言い方もできますよ。
ご参考まで!