this is not a photoshop, while there is an apparent cloning, its not exactly the same, i say this as a graphicsfag. the angle is slightly off, could more have been done perhaps, but this is more of a practical effect ie mirror or camera rather than someone dicking around on a tablet.
what about the buttons, i blew up not noticing anything strange, one thing this could be is a rotated photo, like 25 degrees or so this would create a negative space area, then they could create a duplicate layer and then shift over, be strange to do that though.
Another thought on the possible photoshopping, if this was why is it desaturated and also why are the pixels more blurred, if this was edited the question would be more why was a photo layered on top of another one leaving that white triangle. Again could it be done, yes, but does not seem rational and again leads to a more practical explanation. Also brain shut off is common with myself its fine. Check out what i am looking at the pixels are the similar but not the same.
note on this i just dragged the photo posted in here and enlarged about 800%, when i saved it i only cropped and saved for web. and since this has been saved and resaved there is a potential for degradation, but that would occur all over not in a specific possible reflection, unless it was an original color differentiation, and the blurring a result of lighting and a mirror.
exactly that. its similar but not the same, if it was a clone i would be exact unless they did a blur or something akin to that. Most people who take selfies are in front of mirrors as well so that should be considered.