Hey, Excellent improvements over your first post. I just love the statue and tree stump next to it, I just love those tiny details. I know this is related to the fort more then anything, and I also know it is WIP for you, but I was hoping you might have done something to those trees in your last iteration, and now my worry is you are considering the trees as final. So I thought to bow in and just give a suggestion on the trees as they are so flat and totally lost in their shadowing.
Just very simple and quick, took another green to give it a simple 2 color shade to help define the shape of the tree, then speckled in alternate shades in-between that to simulate leafy/bushy look. Ok so the issue was finding a suitable color for the ground shadow that was already in your image since I used your old shadow color for the dark side of the trees. My best choice was a dark grey, which dose not look the best I will admit
If you could allow yourself one more color, OR change another color to this (which I think could be possible, so at least you maintain color count). I am pretty sure this lighter shadow looks a tiny bit more balanced compared to the dark shadow you had anyway so might be worth doing.
Try mess about with color balance to harmonize your colors.
Well done on the piece anyway its so cute