I agree with this, always nice to have some taller plants at the back!I love the moss, it looks very natural the way you have it growing along the wood. And you have a buce bud! (😠 I'm envious!)
Personally I would add more plants at the back, perhaps some vallisneria to give a little movement to the scape? Though I'm in the "you can't have too many plants" camp so the fish would be hard to spot!