if you dont own a copy of the ModelMasters guide book get one and read the section about the artist's method of figure painting with washes then you will know what im talking about. I follow what they say in the book precisely.
1. paint the area with MM skin tone light base
2. paint the low or shadow areas with skin tone shadow
3. paint the prominent areas with a mixture of 1 part semi gloss white and 4 parts skin tone light base
4. with a size 3 brush (Model Master's Size) blend the low and prominent areas together with a little bit of paint thinner.
5. add to the cheeks, temples, nose, and under the eyes some skin tone warm tint
6. and finally blend together the colors with a size 3 brush and thinner.
the washes in this case are the steps including thinner........(DUHHH)