And here's a quick retouch using the tools above. If you wish, once you have the photos in layers you can use the smudge tool with reduced opacity (say 20-30 percent on the slider bar) and get rid of any sharp edge on the individual photos.
Obviously, if one was to take greater care than I did on this photo, it could provide amazing result as if the photo were one photo, but a montage of images. Perhaps increase the Gaussian blur along the intersection where the photos meet; lighten, darken and of course soften. It's a matter of what you wish to do, experiment a bit it's quite enjoyable.
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