While some designs work as something simple, it seems like this one begs for more. Maybe you could add some more things around the bear, outside of the big, circular design to give it more of an organic feel.
One idea might be... since the negative shape outside of the bear's body almost looks like a moon itself, what if you rotated the whole thing slightly to give it more of a moon-ish impression and then added stars around it? This would also let you add more elements with yellow, and help lead your eye around the composition.
Its a matter of finding the balance between to much detail and not enough. I tried stars initially but they were very busy against the background of the wave.
This was the other colour combination I was thinking of submitting