The roots from the pothos are in the top right. They will grow as the tank matures. And the frogbit will occupy that spot as wellTo me, all it's missing is some structure in upper reaches of tank. Driftwood that creates some shady areas and fills out the top of the tank. I think it would add depth to the tank.
Looks really great as it is however. Nice job. Just think some branching coming down from the top would be nice