I have looked at each of your pics and really would recommend that you use some kind of noise reduction software such as noise ninja etc.
Noise happens mostly when you are shooting in dark places with your iso set high to gain speed of shot such as ISO 800 etc. You'd be surprised how much better those images could look when the noise is reduced or removed. I hope you take this as constructive help and not criticism as the whole point of these forums is to help each other to become more successful in what we do.