Nice view Slobodan, well balanced and nice sky, it's probably the jpeg compression but thats a pretty harsh line along the horizon, it would be much more pleasing to the eye with a smoother transition from horizon to sky. It looks a little like too much clarity/sharpening as it has boosted the dark edge of the mountains and lightened where it meets the sky. Only a small thing and not worth worrying about on a more boring photograph but as this is nice it might be worth correcting?
Mat