Hi, could you please advise how to simulate with vector tools the objects which are far?

In the attached file I tried to reproduce a photo, the right one is the result but the hills are not finished. It is a general perspective principle that the farer objects are more blurred, but I am not sure how to draw that. As a first solution sure could be adding feather them, the most to the farest, but somehow does not like that. There has to be some better solution :-)

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Farer_objects.xar