Whenever I play a wrong one, I just smile and look at Pat. Her being a woman, the general congregation of musicians watching would naturally expect her to be more likely to be wrong. In fact the complete opposite is true, it's me who drops the clangers and pat who's 99.9% faultless.. I've seen her play all day at a convention and not put a foot/chord wrong.
As for facial expressions, if you look closely you'll notice MANY players "Mouth" the notes as they play.
There was I time I played with my mouth open as if catching flies.. until I saw a picture of it.
I must admit to blatancy in the "Shaping" department. My slant is that when you're out front you've got to sell it..Sitting still and just playing is laudable but not very entertaining to the vox populi..
I introduced the Pedal Steel to the Showband scene in Ireland as a "Frontman" and it was an integral part of the job description, not only to sell, but to play lead guitar almost simultaneously. Well at least be "Strapped into it" and ready to perform.. My endeavours brought it to the front and the notice of the dancing populus and music followers.
I sold the steel that well that I cornered the session/broadcast scene, even being an inferior player to what the guru's believed.
Smoke and mirrors worked in the stylistic dept. (I was definitely a plagiarist with my playing) in fairness that's what the requirements were in Ireland, covers of USA records needed to be as close as possible..not having to dream up the parts myself left me free to concentrate on the visual aspect of the job.. Eye contact, acknowledgement of interest and glances in the right direction go a long way to forming the right impressions with the audience.
Here's proof that paper never refuses ink !!

But it WAS believed.. I built upon it..

There is a point where it can become "Overselling" that point can't easily be determined by fellow steel players, they look for different things than the general public do. But Blatant tears on one side of the coin, or conversely, jumping around like a "Blue Arsed Fly" may be beyond what the public perceive as "Showmanship".