ZBrushCentral

Question Please??

I have been studying Zbrush for like 2 years now!! I also learned how to render in V-ray, But the only problem I’m facing is how to do the realistic skin maps such as the Texture map, Epidermal map, subdermal map, Specular and Reflection mpa??
Is there any tips or courses I can take to improve my self??
Thanks in advance…