Finally finished, I'm very happy with the result!
The entire project was made in Blender and textures in Substance Painter. For color management, I chose the ACES workflow for better colors and contrasts. The composition was also made in Blender compositor. I used Zbrush to add some details to the montains and the ship.
I tried to push Blender to the limit, using VDBs, motion blur, a lot of scattering and SSS. I was very impressed with the power of Blender to handle this huge scene.
Thanks to my friends, my boyfriend and to a lot of artist who helped me achieve this result.