unless you planned on putting a birder at the top, then i'd say it looks great as it is. sometimes less is more.
I agree it looks good, unless you are going to put a border on top or some green leaves out of the flowers to tie into the green bottom border.
OOh, I kinda like the green leaves idea, but it looks awesome the way it is now, too.
i think it looks beautiful...i think it would add a lot if you put in some green leaves around the roses on top!