I love your technique here. How you have rendered this with wide range of different strokes and color. Makes one to imagine all kinds of details.
personally I would have scaled up the humanoids so we get more rendered characters that shows us their relationship clearer.
What I would love to see is more line of action pointing us to the action where those humanoids are standing. Right now you got the light source behind them leading us the viewer to them. I am not sure but it's probably good enough in this case
I wasn't sure how big I wanted the environment to be, but to add to the fantasy vibe decided to shrink the silhouette of the figures to make the branches/roots look much bigger than you would normally find in real life. The figures were initially just for scale, but of course as you mentioned, there was no real line of action so the light drew alot of attention to the humans even though they are small and undetailed.
Thanks for giving me things to consider for future pieces.