I began teaching myself how to retouch images with Photoshop version 4.0 (Photoshop CC 2018 is considered version 19). To this day, I still use some of the original processes and tools for retouching. In this article, I discuss the most important step in retouching, then explore the basics of retouching skin, enhancing eye color with blending modes and layer masks, and, finally, problem-solving stray hairs.
I recommend that you use the most current version of Photoshop (which is available as a monthly plan from Adobe). I also strongly advise using a pen tablet over a mouse; your art will only improve with the control a pen allows you.
I thought it was a good tutorial
there are way better techniques than this to retouch images. Why wouldn't you use curves adjustment layers for example.