Face full of Lies
A person who lies so bad their face is like a dirty sock, you can smell the lie from a mile away.
My sister said she didn't eat my lunch, but her face was like she was about to confess.
My dad said he didn't break the lamp, but his face was like he was trying to hide a secret.
My teacher said I did my homework, but her face looked like she was about to get in trouble.