Haywire421

I don't mess with portrait photography but when it comes to drawing at least, we have something called static poses and dynamic poses. I'm not entirely sure, but it kinda sounds like you like dynamic poses. If I were doing portraits, and wanted dynamic poses, I'd treat the subject(s) more like actors, and instruct them to do something. "Take a bite of this apple", "walk across this crosswalk while talking on the phone", "dance to this music", "throw a punch at me" etc. Depending on what you are going for might require you to be more dynamic too rather than standing in a fixed place with a tripod. You might have to work more akin to a cameraman filming a movie. Burst shots could be beneficial.

https://www.google.com/amp/s/blog.daisie.com/dramatic-pose-reference-a-comprehensive-guide-for-artists/amp/

This wouldn't work for people like me that don't like to talk about themselves. You'd get the exact opposite of relaxed