Below, I have taken the uneven Spartan Stadium and put a press box on both sides, creating evenness. This, surprisingly, is not that hard to do, if you know how to do it, that is. However, I have not found a great place that explains this, so I will explain it for you.
Before staring, you must have a photo that is centered, so that the copied object doesn't look distorted. Below, I have a photo that is taken from the center of the end zone of Spartan Stadium. First, select the area you wish to move, then make it its own layer. Then, go to the top and click edit-> transform-> flip horizontal. This should get the object to look right, now all you have to do is move it into position and touch things up a bit.
Before staring, you must have a photo that is centered, so that the copied object doesn't look distorted. Below, I have a photo that is taken from the center of the end zone of Spartan Stadium. First, select the area you wish to move, then make it its own layer. Then, go to the top and click edit-> transform-> flip horizontal. This should get the object to look right, now all you have to do is move it into position and touch things up a bit.