Matte painting part starts from 00:20.
This is a break down of a matte painting project that I had done for my team at school where I took care of creating the background for a fully CGI shot. Matte painting was made based on the concept (first image).
I'm not much of a concept artist but I try to come up with my own concepts for the projects that I work on. Here are a collection of some of those concepts and matte paintings.