Part 1
I went over to the eye dropper tool and pulled down the drop menu. Then, I selected the ruler tool. I took the ruler tool and drew a line along the horizon. I went up to the top of the menu bar and clicked straighten.
Part 2
I selected the crop tool. Next, I drew a crop box around the photo. I went up to the top and selected perspective. I could then move each corner individual until it was lined to how I like it and hit return.
Part 3
I used the pen tool to cut the cars. I then made it a selection and dragged it over to the background layer. I resized the cars until the fit and were a good size. I fixed the vibrance and exposure a bit.
Part 4
I first adjected the brightness and vibrance of the dog picture in raw. I then cut the dog out using the pen tool and then making a selction. I dragged the dog until the background image and resized it.