the colors are excellent but maybe add some artistic lines (dripping, swirlies, etc) if no only to make it a little more appealing to the general audience
please don't add hip meaningless drips and swirlies haha, ugh.
i really like this combination of drawn items and i do agree that there should be some other smaller elements around there somewhere but something that would fit more into the theme than just drips.
like, i dunno, pebbles and stylized grass or something.