Hi Max. Yes. This is a composite of many photos.
This is a quick overview: I first sketched the scene that I wanted to create on paper. From this sketch I created concept art to help me with the element selection. Then I started to look around for the elements to use in the matte painting. Whenever I found something I felt was a potential fit I would photograph it or search for a photo in my (constantly expanding) photography library. Sometimes it would take weeks before I managed to collect all the required elements. Once I had all the elements together it could take another 160+ hours to put it all together. I used Photoshop and also have a Wacom Cintiq which makes the concept art much easier. (Yes I know I could create some elements in software like Maya, Cinema4D, DAZ etc but I wanted to make sure it is all photographic content)