I have a picture of a building which i photoshoped into a photo of other buildings. The other buildings have trees around them so i put in a tree in front of mine to match and to cover a certain are. The thing is, this new tree stands out a bit too much because the edges are a little sharp and it sort of looks photoshoped. How can i make it less sharp so it doesnt look like it has been cut and pasted so it can match and blend into the backgorund without standing out?