It's the best way to learn. Forgot to add (repeating myself from earlier) - one of the biggest enemies you have in this map is the very obvious repeating pattern terrain. You might be able to get away with it if you put down a lot of elements on top if it so the repeat isn't so obvious. I don't use CC3 but maybe one the CC3 whizzes can help with that. The alternative is to put one or two semi-transparent fills on top of the first one to break up the seams. Worth a play.