In this tutorial I'll show you how to get an image, or take one (I took this rock texture on my iphone X from my parent's front yard), bring it into B2M and create the maps for a rocky texture. Then using that texture build out a scene. I use Octane for this tutorial.
I then use After Effects to finish out the color correction and post techniques.
Human model: https://www.cgtrader.com/free-3d-mode...
Hope this helps! :)