Are you a collector and coral showcaser or more of an aquascaper? Right now I'd say that rockwork is set up for showcasing.
If you are going for a more artistic take, my opinion is to think about things like:
- You have all short rocks in the front and tall rocks in the back. This is the "fruit stand" look that most hobbyists like, but it kills sense of depth.
- All 3 taller structures in back are the same exact height. If 3 is your number (instead of 5 or 7), they should vary in height and shape.
- The hardscape is all oriented in the same fashion, the tall ones like table lamps and the short ones like pancakes.
- There's nothing in the top third, which shrinks the sense of scale. I know some will say "space for corals," but if this tank remains up for 5+ years and you have huge SPS colonies that need the entirety of the top 1/3, leave that as a decision for future you, imo.
- Your negative space is a perfect symmetrical T-shape right in the top/middle. Try to work in more of the rule of thirds.
- I would move the entire scape off the back wall and more towards the front pane. The idea is to trick your brain into thinking there's infinite depth behind your scape.