"amateurs"? what do you will produce when you an "expert"?
I never saw such a realistic diorama in this scale, especially when you don't see exactly the faces of the figurines. Il looks like real, also the connection to the background is perfect. When I saw the first foto, I try to find the trick, so realistic it looks.
I guess even in most museums you don't find a diorama in such a quality.
Chapeau