Modular Rock- Siltstone

I am just starting to learn about ZBrush and this was my first project in Zbrush. First, I made the shape of the rock and then added details to make it look similar to the reference picture. I was struggling while doing this project because I did not have any knowledge of the tools that were available. I did not know what tools/brushes to use to recreate the rock. After I made the shape and added the little details, I then used textures to make the model look alive and not just shiny model. After a lot of failed tries, I was able to recreate the rock.