Here is a project I started some times ago and finally decided to work a bit on.
I first went for a warm autumnal scene but finally decided to stay on greenery with a more cold environment.
For the fog, this time I used the usual trick, a sphere surrounding the scene with scattering medium material and a sphere around the camera to control the fog depth (more precisely where it starts).
Modeled with Blender as usual
Rendered with Octane Standalone 4.0 RC5
PT Kernel
Renderd time around 15 min, 25 min for larger images (3000x1680).