Aside from the normal airbrushes, I use these brushes. Click on the image to download.
Make sure that you keep at least three layers.
Top: working layer
Middle: duplicate backup
Bottom: original backup
The logic behind this will be more apparent later on. Its very simple.
Original image - Full version
First using a skintone color, use an airbrush, mode multiply, 50% opacity, in one stroke.
If you need help with choosing skintone colors, use this chart.
Using the same brush, darken the appropriate areas of the face. You can use multiple strokes since the cover is in different areas.
Since we have kept a backup without any alterations, we can erase the eye area and also reduce the opacity of the working layer to reduce saturation.
Once we have reduced the saturation/opacity, use a lighter skintone color add highlights.
