Hi, Polycount!
After some pause I decided to start another pesonal project.
And this time I decided to create something my own.
My main inspiration comes from this awesome Sci-Fi Cave - check it http://polycount.com/discussion/119041/wip-sci-fi-cave-environment/p1, and from Quentin Mabille artwork - https://www.artstation.com/artwork/A6nOX, and for a long time I want to do something similar. The idea is to make some nature scenes with cool sci-fi element,
from which water flows.
So, for now I finished the blockout phase,
watched a lot of tutors about the composition, set up a basic light and began work on the first parts.
I will be glad to hear any feedback, critiques and what you think about it, all are welcome during this topic.
Hit me 
Thanks for watching!
RefBoard

Blockout

With rocks


And some assets:
Rock textures made in Substance Designer, check graph there -
https://www.artstation.com/artwork/AgmqX 

ZBrush sculpt, I am planning to do more variations of rocks later

Replies
Resculpted main rock, because the old rock looked bad as for me.
Sadly that many details are not visible in the UE4.
I started working on the Z-oriented moss. I guess I'll redo it, not sure I like how it looks.
And I also did some work on the design of our sci-fi thing.
And what we have now
Hopefully, the next update will be faster.
So, I think, the basic design is complete, and I can move on to the high poly and details. I hadn't thought up design of pieces like this before, so I will be glad to hear what you think about it.
And my refs board, where from I copied the elements looked for inspiration