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Workflow for Recreating a Mural layer by layer

Hi Everyone,
I’m completely new to Zbrush and am looking for any advice on a project I am working on. Basically, I am taking a mural from the 1800’s that I’ve made a model of in Agisoft Photoscan. I am trying to tease out the layers of the mural sequentially, so that I can show how the mural first looked, and then was subsequently added to create what we see today. Ideally, I want to create a series of layers where I have sketched in the sections of the panel, so that I can eventually present them from start to finish. Can anyone reference any tutorials or have any advice on how to accomplish this through Zbrush? Thank you.