Okay so this is less about painting skin, and more about finding and appreciating those tones that are often discarded when painting digitally. It’s these tones that will set your work apart. There’s no need to go looking for colour swatches when you could just go build a library for yourself!
I threw a yellow over the bottom three in various filters to get the shown effect. But again the possibilities are huge so.. go experiment /o/.
You can do this with as many photos as you like! Just don’t stress yourself out if you feel you can’t find 15 colours, but try to make 9 the minimum.
(I said no fashion photography because its commonly heavily edited to the point you can only see two- three shades/ tones :c.)
Sorry for any spelling mistakes orz. I’m too lazy to go through it again.