The other thing is more showmanship than playing, but I think its important and my family has always taught me its important. Perhaps instead of always shoving your face into the piano, once in awhile look up above you , kind of like your smiling at Chopin in heaven. Its silly , I know its showmanship, but it seems like audience's like that kind of thing. And when you end the piece, dont jump out of your seat like your pants are on fire. Sit there a moment , like your showing reverence to the piece of music you just performed. Yes again its all show business but if you show great respect to the music , so will your audience show great respect to you. At least thats what my family tells me. Like I said its not really the playing part, but it is part of being a pianist.