No -- it is solely due to your darkening of far distances with your application of a gradient (for burning). It is something we had to train our students not to do -- they so much want to darken those far mountains and sky, but they just end up removing any sense of atmospheric distance...or they will darken the trees and mountains behind a lake -- making the reflection lighter than what is being reflected (that rarely happens in the 'wild'). One can mess with the relative tonalities all one wants, of course...as long as one is aware how the changes will affect the way the viewer will interpret the scene.
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