I highly suggest you using Blender Landscape file with clouds and modifiers FBX and OBJ files without clouds (because its like... an EEVEE fearure xD)
I got an idea to recreate the artwork of Sandra Ve in 3D, to let her dive in the world she imagined and drew. Based on the artwork Landscape practice By Sandra Ve: https://www.artstation.com/artwork/bKmGmv