However she bows, she is an extremely gracefull, classy Lady, as we all agree.

Orla also moves her left arm in time to the music most of the time...which I expect may be a result of so many years of playing the harp, and also when she is soloing, I think so David can follow her tempo.
To be sure each of the Ladies has their own uniqueness..which, according to David's Downes' interviews, is something they sought to preserve.
I find it interesting to watch how their interactions on stage with each other and their surroundings has evolved. They are obviously more comfotable as time goes on.
Bp
And yes I totally agree about her smile...