I've got a lot of pointers, but I'll start with a couple that should help you out. :)
Faces; choose a medium skin tone, wash with a brown tone mixed with the base color and a very tiny bit of red.
Highlight with the base color mixed with white.
Remember that shadows are easier to paint if you turn the figure upside-down. Bottom of the chin, nose, and eyebrows.
Highlights go under the eyes, bridge of the nose, upper lip, and the chin.
To finish it off add a little rose to the cheeks and add dots for the eyes with a 0.05 artist's pen. (Dotting the eyes) can also be done with a fine point pencil for scale effect.
For the clothing you can use the same processes mentioned above, but you can get away with dry brushing the highlights after a wash.
The secret is actually just getting the blocking clean.
But for best results, always wash with a similar color to the base color (Yellow vest- orangeish yellow wash). An overall black wash on your figures will make them look dirty, especially in the smaller scales.
Of that advice, use what you want. There is more than one way to paint a figure and I encourage you to find out what works best for your style. :)
Now, I can't wait to see how you do. :D