I tried to create a dark forest environment, or "that dark movie theater environment", this time without using clouds :) and at the same time keeping the design simple without many icon options. I used only the 3 Mesas symbols by Herwin Wielink, plus the pine tree icons, the cave and the crystal, varying their positions, colors and directions of the symbol (mirror).

On the lightroom i use mainly contrast, overall color saturation, clarity.

as i desaturate the Blue, the color becomes "grey" and using strong dark vignetting this grey becomes "night".

after i think in a moon... just create 2 circular/radial filter and push exposure to extreme. the first one bigger and more difuse intentisy on the borders, and another inside - smaller and more intense on his end - to emulate a moon and his aurea.

hope i can help

Took me a lot of time to do this one, was inpired in Seven lakes Region in Argentina.

Many hidden spots to discover

Cheers

Action Battlemap with @forgotten_adventures free assets and CC3+.

Cheers

look closely at the lighter green lines (above) which I didn't draw with enough patience. You can draw with the necessary patience or "Hide" the flaws with another icon.