Really Awesome Work, At first I thought that you’re going with a real life sort of realism, and it was giving me a fantasy vibe due to the bloom but when I read your description about it, it is for a fantasy Role play game so you really captured the essence of the fantasy aspect. Fantastic Work.
I wouldn’t call this realistic but its pretty good. I think that it is way too bright, also make the shadows less darker if you want it to be more realistic. The spots of dark black shadows don’t look very nice. I also noticed there is a tree with pink leaves, and I’m guessing this island is set in the spring or summer, so I’d change all the leaves to green.