Entire project was made from poliigon.com textures. It shows the variety of textures that the site is offering. Snow textures works great for close parts of the scene but also for mountains that are far away. We also used road, cobblestone, overlay and rock textures. On top of that site is offering amazing HDR which we used to light up the car and scene.
Terrain is fully CG and we modelled it in World Machine. We also baked the diffuse texture for mountains but instead of using it as diffuse we used it as mask to sepperate the rocks from snow. Then we created shaders for snow and rocks using poliigon textures and used mask from world machine.