Now that kaisash mentions it, I see that hes guiding those fireflies via leashes. That's a fantastic little detail you added to all of this.
What really grabs me is this background you put in, the eerie mist that hangs around the trees, all the colors blending into this mystical form. You have this paper-like texture in all the trees, funny. Everything has a naturally mysterious feeling.
"Wheres this guide taking me?" Oh no, oh my. Haha. Lookin' more at the fine details, I love your grass. You must of taken a brush and thinned it out. It made a good effect, it flows well with the kind of environment you built. And in the far edges of this, it almost looks like paint build-up, bumpy little textures that look more like moss.
You have a keen eye when you illustrate, I hope one day that I can do the same thing. Keep up the amazing work friend.