I have created a sample texture, an alpha map, what you can use as simple details when you are using Zbrush, or any other software, i need to write this is just one sample, in the future i will share more on patreon. Here you can try out the samples, and if you are fine with them, you can decide to join, and download the whole library.
Patreon: patreon.com/user?u=83101586