Pretty! The crypts are so nice looking.
What about pushing the crypts to either side a little and making a stream from small river rocks through them? Don't center it, put it to one side a little and make it narrower in the back than the front. Use the smaller stones to the rear as well.
I am not a fan of the presentation of the Anubias. Is it on a bit of wood? If so you could put it at an angle overhanging the 'stream'? And could the end of the wood be anchored with a number of larger river rocks extending about 1/3 of the height of the tank?
Effect might be that of a stream diverted by a rocky outcropping with an old log or tree overgrown with epiphytes. Well, in my eye and maybe yours. It likely would just be a nice looking tank to most people.
Could the unknown plant be some sort of Hygrophilia?