My mom & I came across an article once on arranging that said when you think you are done, take away half the flowers and start again. For most arrangements, I don't do that, but for an Ikebana one I often end up using less than I'd intended.
Your arrangement does have a lush "secret garden" feel to it... if you wanted a more natural look, you might see how it would be with the front center tuft of white removed as well as the back center white sprig & purple bloom... just to open it up a bit...
I love it the way it is now, too!
