This is a pretty nice save. I'd reccomend using more varied colors of elements (as in, more PQRT rather than deco). There are many different ways to mix terrain, but I think that this terrain is pretty well-mixed. Salt and Clst can be annoying to use since they both come to the top of the terrain and react with water, but there's nothing wrong with using them. I think that you used them pretty well, I just wouldn't use this in a save with water.