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You have increased the saturation and I like the resulting color on the land - rich browns greens yellows and reds. The sky has little patches of red which I find a little distracting. If you have Photoshop I would get an "adjustment layer Saturation" and then 'paint' out the increase in saturation for the sky. Perhaps you like it this way so you can ignore my comments. Keep up the good work and have a great day,

Thank you very much Tony for your suggestion and I'm looking forward  for the changes you were talking about to see and learn how to change them, thank you again. best regards

Nima - if you load the original image I can work better with that and then tell you the steps I took. In the meantime I tried working on the colors in the sky and got this result.

Thank you Tony,thank you very much for your kind,but unfortunetly because of the low speed internet here in my country I can't upload the whole photos file at all. But if you could inform me how you change the colors and other things,it will be so appreciated. thanks again . Nima

I was not expecting the original sized image but a reduced size but without any changes.  My suspicion is that as you increase saturation and then lighten the sky you reveal discolorations. In order to correct that discoloration, I used Nik capture NX (A NIKON PRODUCT BUT CAN BE USED WITH OTHER IMAGES). It has U-POINT TECHNOLOGY. In this case, I insert a 'control point' in the area and I desaturate the area to get it to grey. I believe that Viveeza plug-in for photoshop allows you to use the the u-point technology. You can probably do the same thing with photoshop but with layers and hue/saturation.

Google "viveeza free tutorial"

Good luck

Thank you very very much Tony, thats very kind of you that spend time or saying me the words, I will send you the bigger size the internet speed letting me. thanks again. Nima