i have to disagree with this. its just their face..like a book, if you wish to know what's inside you must read and engage.I have my theory about resting bitch face syndrome. It's caused by people who hate themselves. But they live in an occupation where formal rules dictate behavior of a certain hospitality or you're out of order. Therefore their mind continues to think resentful thoughts, even when trying and utterly failing at relaxing.
Hate is it's own sort of energy device. But like eating sugar such as candy causes short lived fake motivation then you crash and burn feeling horrid afterwards.
You can't force things in life, they just happen. You accept your karma and flow with it. When your actions are bad, karma pushes you where you deserve. When people don't like it, they don't fix the problem. Those are the reasons behind the hate, anxiety, unhappiness, and depression.
No physical material substance will fix you. Not drugs of any kind, nor greedily acquiring possessions and status.
Because true happiness comes from within and you can tell on their face those who've realized this by just looking at their resting face.