If I'm working with other people, usually rest my chin in my hand and cover my mouth when I concentrate specifically to signal that I'm not angry and can be app

If I'm working with other people, usually rest my chin in my hand and cover my mouth when I concentrate specifically to signal that I'm not angry and can be approached because my eyes often suggest otherwise. It's not really a conscious effort or anything, but it certainly changes my expression from "angry" to "furrowed brow."