the 4th picture you can see where the shading, normals and edge smoothing are off.
the 1st or 2nd shot the plane doesnt even look like its part of the photo, it looks like it was added post process (which is wierd).
some of the other photo's have some edge blurs and noise added to hide imperfections, but the errors 3d and filter wise on the 4th shot give it away if its a 3d model.
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