Good evening everybody. I am new here and I am an amateur and enthusiast of photography. I have Canon EOS 500D and I seem to have a problem with taking photographs outside. No natter if I use a standard 18-55mm or 28-200mm, the photographs seem to be a bit greyish... I thought that it was maybe because of the polarising filter, that the photos are a bit overexposed, but nothing changed when I took it off. I usually use the camera on P option where I change the white balance, depending on the weather and the styles. I am not very advance and confidence in using Manual mode, although I occasionally try to practice taking photographs in TV and AV mode.
There must be something I am doing wrong.

and afterwards spend a lot of time processing the photos on the computer so the look more or less presentable.
I want them to be nice sharp, clean and with black that is black...
I really need help and an advice.

Here are some examples.
https://picasaweb.google.com/1055791...42143760202418
https://picasaweb.google.com/1055791...58031708282642
https://picasaweb.google.com/1055791...58009237816306
https://picasaweb.google.com/1055791...57950967759106