I do faces pretty much the same way all the time. Mixes vary a bit to keep skintone varied.
Base with tallarn flesh (a midtone flesh).
Wash with flesh wash.
Do eyes - usually VMC Ivory, with a Black-with-a-touch-of flesh pupil. Pure white highlight dot sometimes.
Clean up face with tallarn flesh.
First highlight add a touch of light mud (light yellowbrown 'bone' colour).
Second highlights add a touch more.
This leaves you with a 'flat' face. Its fine for tabletop, but is a little 'mask-like'. Glazes bring it to life:
Glaze strengths vary greatly depending on the final tone needed.
Glaze lower lip with a dark red (VMC burnt cadmium red) or purple. Perhaps mix in some flesh tone or brighter red depending on the end tone aimed for.
Glaze cheeks and nose with blood red (VMC flat red).
Glaze under eyebrows and under eyes with a purplish blue (VMC Oxford blue is nice).
For stubble, glaze with a mix of fleshtone and dark grey.
Re-highlight where needed, and 'stripe' the lower lip to give it some texture.
Usually takes me between 15 and 20 minutes to complete a face through the steps above. Typical result: