What is your wall made of? Brick, large pieces of stone? It is kind of hard to decern from the zbrush model. Check out the Projection Master in Zbrush! If those are indeed bricks, try to imagine how they were made, and with what materials. The detail on the bricks now is too large. Bricks are normally more gritty than…
When you re-isolate the brick does the detail come back out of curiosity? When making the base mesh of bricks in Max I take it you're offsetting them to repeat, if so you haven't got a duplicate brick which covers the one you're isolating when they all show?
I think you have more freedom to do more unique detailed pieces since this is a portfolio piece, why optimize a scene when optimization isn't a core concern? I would do enough modular work on the side walls to show you can work that way. To spice up the modular walls you can do a few brick clusters, that can cover up parts…
Why not take a step back and use bend on some basic brick shapes and use those as a base to create your materials? Same idea but you're taking a step back and dropping your dependance on a straight brick material. Instead you would be shaping the bricks to match how they would be shaped in real life. If you keep the…