Fizzer once told me this about the "Create a beautiful map" trophy:
It's a very exclusive trophy, it's not something you can really "go for". Think of it like a beautiful girl -- you can't just walk up to her and ask what you need to do for her to be attracted to you. All you can do is do your best and hope it works out.
Edited 7/27/2017 21:21:50
The best chance you have is to make a map that you feel is more beautiful than any other WarLight map in existence.