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Thanks! A big part of getting that is using a high quality circular polarizer. I never shoot landscape without one if the sun is out. Extremely handy filter.

Can you give me some advices on how to take those kind of shots?

Man, that would be a pretty big tutorial, delving into many aspects of photography and angles/CPL use, maybe I'll find time to make a tutorial, but quickly, I'd saw find a cheap circular polarizer for your lens and start playing around, thats how learned :)