



The above are the originals.
And the following is the comparison of the original and the final.
In fact, it is quite simple, but I found there is a very practical tool in photoshop which is called "mask".
because of it, we needn't delete those parts that we thought as useless.
What we need do is to hide them, and whenever it is necessary to go back and do some editing, we can. Very convenient!
