Hey. A few suggestions.
1. Ensure the rock work is stable and well joined together.
2. If the liverock is of good quality and relatively pest free, it can help your tank to mature faster. How confident are you regarding LR from hobbyist whom you don't know?
3. IMO, less rock, more coral. Provide caves and swim thru for your fishes, shelters for corals prefer less flow, as we as a mixture of varied light and flow conditions to suit different animals.
4. Composition wise, rule of third, negative space, depth, all these are ways to help the whole aquarium look balanced.
5. Before building the rockwork, it helps to picture the grown out aquarium in mind, how will different coral fill up the scape. Plan accordingly.
All the best!