I would doubt photoshop, you would have to be a master of photoshop to make it look that good. Once you work with photoshop long enough there are a few key things that you can look at that might tell you if a picture is a fake and this one doesn't have any of those.
Three-fourths of the Earth's surface is water, and one-fourth is land. It is quite clear that the good Lord intended us to spend triple the amount of time fishing as taking care of the lawn. ~ Chuck Clark