You have a very nice looking tank. And it's a great size to do a lot of things with.
As for advice on improving it, that's a ticklish question, since aquascaping, suitable discus tankmates, etc., are really just a matter of personal preference.
What do you feel it might need to change/improve it, in your view ?
Just as an observation, and not being critical in any way, it seems to me that your camera &/or photographic skills do not show your tank to best advantage, and probably doesn't do justice to the way it actually looks in person.
Also, it seems your tank may have a yellow/greenish tinge to it, but that may be just the lighting, &/or camera settings.
Everyone has their own way of looking at aquascaping, and who's to say, really, that one is better than another. You've probably seen & looked up many large discus tanks, and seen some that you'd like to emulate. I have too, but I don't seem to have the inclination nor the patience to do it.
I have a much smaller, low-tech planted discus tank than yours, that I'm not particularly proud of, but it suits me at the moment, and just for the hell of it, here it is, if you care to have a gander at it:
Forgive my rambling on, but I wouldn't mind discussing this a bit further with you if you have any thoughts regarding my comments.