Hi everyone !!
I watched the movie several times already and still I'm a huge fan of the environments, of course I'm far from the artists levels but I wanted to give it a try ! Thanks a lot to SPA youtube channel for their amazing tutorial :) ! and thanks to all the artists for their amazing job.
[update]
Thank you to EmberWickArt for his help and paintover, it was super great and nice of him to take this time.