Hi there !
Usualy I always base my environments on a lot of references and inspirations, but this time I felt stunned by a concept art of Santa Norvaisaite : https://www.artstation.com/artwork/xz9m0X
I asked for her benediction to make it live in 3D and she was thrilled with the idea.
For the context it was rendered in realtime with Unity 2019 LWRP. There is no use of fancy things from the engine, it's the legacy Lighting system and the official post process tool.
I would like to emphasize that I saw this environment as a scene composition and an exercice on mood / atmosphere creation. This is not a production creation, this level of detail is not present on 100% of the map. I would also add the fact that I used some megascan assets to populate the terrain with rocks and grass.
Little note : there might be some details not coherent from one screenshot to the other, since they have been made in a slightly different time frame.
I would like to finish this post with a small "breakdown tool" I made to visualise interactively one of the point of view in your browser : https://novashade.itch.io/hownwall-castle-breakdown