Olá, thanks for the sugestions, i'll try to move the branch a lite bit down, actualy tere hare 7 pieces, not 4, and 5 stones. I'm litle in tuch with the teory of the numbers.
My idea is to put another drifwood on the botom right side, in the place that the SAE are reasting in the foto.
Im the behind of the right side are the Ludwigia glandolosa, that is a lite short at the moment, maibe help the layout.