So I looked into these pictures for a while, and there are a few small discrepancies that I noticed that may contribute to the pictures being fake.
In the two areas I circled in red: the bush/tree looks like it was cut out from a different picture at a different angle. There seems to be a darker shade of blue immediately surrounding the bush/tree which makes me think that it was cut out from something else. Why else would this different shade be there?
Regarding the circle near Palutena's head: the floating thing behind her, at least in my opinion, should show up, even the slightest bit, to the left of her head. The right of the floating thing (from our POV; our right) stretches far enough for the left side to show up past her head in the picture. It isn't there, however. These two discrepancies might just point to the thought that these leaks are indeed fakes.