The facial expressions could probably benefit from some combination of practice and coaching. The body language one is harder because, as I said: comfort. If I need to be sitting a certain way to not be cramped or trapping sweat or sliding out of my chair or whatever, that is going to take precedence over doing something somebody told me would indicate interest. Otherwise I will be uncomfortable and then my body language will eventually slide towards indicating (insofar as it indicates any true thing) “I am uncomfortable”, which isn’t right either.
The facial expressions could probably benefit from some combination of practice and coaching. The body language one is harder because, as I said: comfort. If I need to be sitting a certain way to not be cramped or trapping sweat or sliding out of my chair or whatever, that is going to take precedence over doing something somebody told me would indicate interest. Otherwise I will be uncomfortable and then my body language will eventually slide towards indicating (insofar as it indicates any true thing) “I am uncomfortable”, which isn’t right either.