I use reaper paints so they have shadow, base, and highlights set up so I only have to mix tones together to get what I want so let me see if I can direct you to what I do.
For a fresh face (I would call this, Fair Complexion) with probably wind burn from Russia
Start with a mid tone
View attachment 91608 and don't thin it very much, you want an even color
work the basic shadows with
View attachment 91609 thin this out pretty good so it blends slightly with the base
Then use
View attachment 91610 thinned well to blend all the colors together. as you push this around it shoud loosen up the other colors but if it doesnt I have three mixes of all the colors at the same time and add a bit of one and then a bit of another and blend them at the edges.
Now at the same time you have to thing of the stark highlights and wind color.
Add
View attachment 91611 to the top of nose, forehead, top of cheeks, chin etc. wherever you want the brightest color to be. then mix a tiny bit of thinned
View attachment 91612 to the side of the nose, under the eyes, etc. wherever you want a slight coloring.
finally, being very very careful, thin out
View attachment 91613 which should be a blushing rose color. and apply to the cheecks and tip of the nose, wherever you want wind burn. VERY small amounts at a time so it blends. you may want to do this as you work in the blending color of Fair Shadow because it will look almost airbrushed if you do. Quite nice really.
After that add any of each color, very thinned to whatever you want changed. After each large step you need to wait for everything to dry all the way because they blend more than you think they do when wet or just barely dry. I have thought a piece had great contrast and went to bed, woke up the next morning and I could barely tell! I hope this helps!
The colors are named after the Reaper paints I use but you should be able to mix your own from whatever colors you have.
Also if you want more working time in acrylics. Instead of thinning your paint with just water, get an acrylic Matte, fluid medium from your basic hobby shop in the art supply section. It's used to thin out tube acrylics for painters. Mix one part of this to one part isopropyl alcohol, to 8 parts denatured water. now you have a thinning agent that will separate the pigments and spread them evenly while thinning the paints and giving you a much longer working time. I have a bottle with a dropper tip and use this for thinning for airbrushing and hand painting and it works really well! I just came across it this week.