The more I tried to introduce big changes, the more I realized that I was quite satisfied with current state of the map and didn't feel like drastically changing it (like adding a whole forest cave entrance or something like that). Thus, the final package is not very different from the previous WIP - I added a lone birb, bunch of autumn leaves and more bushes, trees, rocks, etc. I think, it's the most I can currently do with the self-imposed challenge of not using a single imported file
Attached map was updated to match the final version