I am not too sure about your choice of aperture here?
You mean to put the little lonely conifer into focus, as the lonely element in amongst all the other green trees in the background? Hence the title "Green Solitude"? Well, I interpret it this way ... and instantly feel that you would have needed to stop up your camera a lot more to get a blurrier background. It may just be me but I feel that the difference is too small between the in-focus little conifer and the out-of-focus (very busy!) background.
As to things that can be done in PS?
Well, one attempt has already been made, and I tend to have my own pics darker than most, too, though with this kind of green I wouldn't go that far, plus I would not change the colour temperature to as cool as it now is in the edit by deadtoaster. I love the amount of yellows in the original.