Its not that complicated, only took 10mins, see the attached pic.
The first pic is the basic image
For the second pic i have adjusted the levels, and adjusted some of the colours using replace colour (in photoshop... image>adjustments>replace colour)
There is a big step up to the third pic. I cut around the close objects (the whole of the bottom part of the image until the track drops away) so i had seperate layers (which makes things a lot easier when you need to blur) for the close (unblurred) and distant (blurred) parts of the image. I also added the grass by using the grass brush, to create the shadows on the grass i selected certain parts and used the burn tool.
At this stage i thought it was finished (some people might prefer the 3rd pic to the 4th
... i dont). But i added another layer and in the end, it changed quite a bit
Does that help ?