Have you decide what will be in the back yet?
I'm thinking of either a large clump of Rotala roundifolia in the middle or a combo of Rotala Magenta and Diandra. This would add a lot of red color to the tank.
On the right side, I have a large mass of needle leaf java fern that i will place behind that tree.
I'm still undecided on the left side, the scape suggests leaving it all as hc in the corner and filling the "hill" with larger mid and background plants.
I'm open to suggestions