Frequency Separation Photoshop Action
I use this retouching technique to even out tones, especially skin without losing texture/pores, and remove unwanted artefacts.
This action separates the layers for you but you're going to have to do the retouching yourself! You'll find tutorials on Youtube that'll show you how. It's basically using the heal tool, sampling, and clicking (or tapping if you're using a tablet like I do) ~2109 times.
In this example, the model's skin is quite flawless so only slight retouching of the face was required. The sunburn, milk droplets on her shoulders and shine in the water needed to go. This was edited a while ago as I was learning (forever so!) but you get the gist.