My advice would be to forget about textures and rendering for now because there are a number of things to fix in the high poly. Like brian asked earlier, what are your references? And if you´re not using any then I´d start by getting a few. Like grabbing images from a scan like…
It might be beneficial to get a 3d female head model and place it in your zbrush scene, lay it on top and/or next to your model to see the anatomical errors you currently have. When starting out you won't see the obvious because your eye is not trained well enough resulting in poor decision making/sculpting. If you are…