Looks like a lot of the plants need more time to grow in. I think you may have some trouble keeping that pretty sword small enough in the future. The Pogostemon (Eusteralis) stellata also seems a bit large for the size of this layout.
Are you going to try a Hydrocotyle verticellata/Glossostigma mix in the foreground?
One way I use is pruming the roots, like the bonsai. That plant is the Echinodorus “rubin” narrow leafs it grows short but large to this tank, but I like the efect, I've been told that I fill to mutch the tanks, thats one the things that I' ve to improve.