@hideki
It did fool me...
On a mobile screen, it does look like a photo.
@matrixsasuke wtf how i didn't was notified of your post? How strange.
You have to check closely for geometry too clean or lack of film grain/noise. Any place that's too perfect gives it away.
If you check that render, the paint of the bike is too clean and the rims of the wheels are unrealisticly shiny.
Had doubts about the material of the sidewalk and chose another one.