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Hey alienmem
The "fan-art" poster quality is not to good to begin with.....basically it leaves you a lot of work to do before you can make it look half decent for your cover creation.
Due to colour variation of the grass and the small amount of work-space open to you, cloning is not a good option.
However, you can erase all the grass and blue from the BG of the image (and make quite a good job of it) in about 30/40 mins. Then just replace it with a perspectively scaled grass image which can be found on the interweb (as Venome did for you).
I made an example for you too see the difference between your cloned version and my replaced an image version
However, as I previously stated the "fan art" poster is pretty poor quality....and you have a tricky job in front of you
