Is that rock from EA or a custom made?
*Your next world, you can think about what paints you want to use and think of layer order- such as Rocks at the bottom, dirt, sand, crops, grass, water, snow- that kind of thing. Plus, test some paints to find which work best in what layers.
You can always export the layer png (like the land map), delete the paint layer if it's too low, and then add it again (which will make it higher in order) then import the paint map (if you have some areas you want to keep. Just remember if you import the paint overlay it might be stronger because it's higher in order. :)
You can test it with a Save as copy of your world then delete that test after you're done.