Here is a truly amazing video for you to watch. It is a deaf percussionist Evelyn Glennie showing that you need to not play a song exactly as the sheet music says it should be played; there is something else a good musician can add that makes it much better. Think about how you can use what she tells about percussion instruments on the piano.
http://www.ted.com/talks/evelyn_glennie_shows_how_to_listen.html
I know it is long, but what Evelyn Glennie says can completely apply to the piano and really inspired me to “listen” more to the music I play on the piano.