I'd say it looks pretty darn good. A few minor things to tweak (if it were me but you don't have to): the blue outer glow around the land is kind of bright so I'd tone that down either with more gray in the color mix or turn the opacity down a bit; same with the dark blue stroke; as for the mountains, you might want to group them together a bit more to form mountain chains but maybe it's not needed for your world. Still, looks really good.