Just adding some definition to the clouds makes a lot of difference. The rules of bonsai say no foliage from the top of one cloud may touch the bottom of another cloud above it and vice-versa, maintaining air space for the birdies to fly through. Branches that are too thick to move stay put and lesser branches need to be wired to complement the movements of branches surrounding/adjacent to them, and any that won't play nice are exiled to the burn pile. Nice tree!