I did this work in 20 hours in total, I did a lot of rendering, I tried to make it the best for post processing. I post process volume indirect and mist data separately. I didn’t use assets in the scene, I sculpted the stones myself in blender, I reduced the polyguns with the decimate modifier. I made a vertex paint process and mixed the two textures together. I made the trees using the SpeedTree program.
With Compositing
Without Compositing
Viewport Render