https://www.skillshare.com/classes/Advance-Portrait-Retouching/1778748716?via=search-layout-grid

This class will walk you through the process of retouching skin in a more realistic way. Well you won’t only learn how to retouch skin, you will learn how to clean the lips, how to use the patch tool and you will learn some other skill that will help you properly retouch your portrait in Photoshop