I think they've put in some surprises for the ones that dig in to the material like me. Found this funny detail on the roof of one of the buildings;)
NORing
EDIT: Sent them a message and here is the response;
Hi,
Thanks for your comments !
You found the turtle, one of the 10 easter-eggs of the picture !
Regards,
Guillaume Tilloux | Kolor Customer Service
Guess I need to spend some more time looking at it. I'm too competative!....