I was inspired by animation named ‘Piano no Mori’ (The forest of Piano).
Reference is the animation and WonKwan Jeon's personal work, it is called 'Forest of the piano'.
I found this reference on the Art station.
For this time, I felt so many difficulties for optimizing the foliage scene.
When I use lots of foliage, the file gets bigger and bigger, could cause some issues. Therefore, this time I studied how to optimize the volume of the foliage.
It was such an interesting and useful work 
Thanks for visiting!
Reference - https://www.artstation.com/artwork/2xg1Le
Video