Not all people's faces work the same way. Some leak all their feelings and others have the same face for nausea as they have for nostalgia, and it barely differs from their sleep face and celebration face. Then there are the never-smilers and the permanent-grinners, the "you're not subscribed to this channel" poker faces, the perpetually surprised faces (who may or may not have had work done...), and the rubber faces who can express ecstasy and agony in high definition.
All these faces are like the Bible. The truth is in there, but you need the Holy Spirit for accurate interpretation, as well as a humble heart. Add the willingness to ask questions with sincere interest, and you MAY just arrive at an accurate reading!
Why this now? Because my heart breaks when those with the unreadable faces get labeled by the feeling leakers or smile fakers (did I forget to mention those?) as unapproachable, standoffish, hateful, blunt, or passive-aggressive.