Thanks for the reply guys. The idea is the tree to stay on kind of hill/island that is why the left side is lower and will be filled with HC. I even try to use the golden ratio and golden spiral in that skape. The focal point will be the V between the big rock and the drift wood where I will put Hudrocytile or Marsilea. I want to achive "Island " type skape mihed with "Iwagumi" the pure Iwagumi looks very traditional but uses some rules in the rock arrangement which can be used in other styles.
I understand, but the dip is below 'sea level'. It will still read as a hill if the front soil level is straight across the front, imho.