Very nice. I like the style. It looks like it was created via an old style Calligraphy pen or brush. I especially like the 2nd one with all your notes as it provides great insight into what you are going for.
Not sure I like the look of the trees when they overlay other stuff. It might just be the way the River layer drives through them. Maybe if the trees just overlaid whatever is beneath them it would look a little cleaner. The rivers would then just peak through wherever there wasn't a tree covering them. And that one tree down near the bottom center that overlaps the Ocean - I would be tempted to loose that one altogether.
Thanks for sharing this I look forward to seeing more as you continue to develop.