 So you wish you could layer, not a problem. If you are familiar with Photoshop or Substance or any AAA level art software, then you will be happy to know that ZBrush actually has a layer function. If you would like to organize what you do into a single layer under layers, click here, name it, and if you can see the words saying REC, then that means that you are recording your work. From this point, anything you do to modify or sculpt on your mesh will be stuffed into this layer. For now let's say I wanted to add a texture to her skin to make her a little like Mystique from X-Men or something. When I'm done, click here, and you'll be able to toggle the work on your layer visibility on or off. You can change the strength of it here, or if you go below zero it will actually invert the details on your layer. You can make as many layers as you want, and if you ever want to record more on the same layer just press the circle. Hope that helps. And as always, hope you have a fantastic day, and I'll see you around.