I just bought a polarizer and a set of ND grad filters. If you are the kind of person who doesn’t know what it is, just regard it as new photo gadgets for me to play around with 
. If you know what it is, I bought cokin ones to so they fit for all me lenses.
The picture on your left is one of the first shots I took with the polarizer on, and it seems to work just fine. It is supposed to remove non-metallic reflections which means it will often remove the highlights and thereby saturate the colours. What it does exactly to the photos, and when to use it I still don’t know. So I have spent the last few days playing around with it.
Returning to the photo on the left, it seems to me that the colours are more saturated than I would have been able to get them without the filter, but this is one of the shots I didn’t shoot without the filter, so I don’t have a direct comparison.
Composition wise I aimed for the rule of thirds, so each of the flowers is on line separating the image in three equally sized parts. I have added a bit of contrast in post processing, but nothing too fancy.
/Kristian
