This is based on original art by an artist named xiaodi jin. I found a page of his work including the painting/print/render (not exactly sure) this diorama is based on here:
https://www.artstation.com/xd_king
The art work the diorama is based on is called: On The Way
I really love this piece and once I saw the art it was based on, which looks even more incredible, I caved last night and pre-ordered from BBTS.
I wish I could order prints of some of his work as well. So many talented people out there with fantastic imaginations.