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Well, one question I can answer with absolute certainty: is it not 3D! It is a two-dimensional representation
Some of the oft-related clues are there, others not, but in the end it is a throw of the dice, and for me the necessary feeling about the shape and size and volume and feel and texture, and very importantly, the spatial relationship between foreground, middle and background, do not add up to something where I can squint a little and imagine that I am there. It looks like a (very good) photo of reality with very good texture, and two layers, foreground and background. I think I also miss the colour. I think colour is an important 3D clue, although I am not yet certain about that.
I should qualify this by saying that in all the time I have frequented this forum, I have seen maybe something like a dozen photos with convincing 3D. It is very hard to do, even for those who do it the best. I am not sure that I have made a single photo which has as strong 3D as brainiac's portrait, Martin's leather chair, or Luka's snail.