YO what's up! The freaking software Gaea is absolutely amazing. I just got it today, and it already allowed me to whip up this (sorta practice/test) environment. Everything is procedural node based, so you can just spend hours micro tweaking every little detail to get it right. Anyway, I'm in love with this software.. can't wait to see what it can do when I really try. ALSO, on the Blender side of things... The volumetrics seriously make the scene. The clouds/mist/etc. is kind of essential for translating that sense of scale. The specular on the ground is literally an image of grungy concrete plugged into the roughness, works really well! Since my overall objective is to build environments for animations, I'll have to do better with optimization. A single frame took around 5 minutes to render which ain't great!