Creative title I know!
Right now I am still experimenting with the lighting.
Most of the materials here have been created with either created with photogrammetry, or have been processed in Substance Alchemist from photographs I have taken. I did use some textures from textures.com, and some materials for blending from Substance Source.
For the stone wall I sculpted the base normal map in ZBrush and finished the material in Substance Designer. This was also my first time trying out Speed Tree. Very handy software. Most of the bark materials on the trees I created in Alchemist, although I did use some some textures that speed tree provided.