Hello, it was rather a test for me if I can paint some random faces and I think it succesfully done.
1. Some thin, randomly placed white paint.
2. Now look for some faces and highlight them.
3. More highlights.
4. Add some shadows.
5. Unify color with surface you’re painting on.
7. More highlights and details added.
8. Red accents, some more details and white dots. Done!
Hope you find it useful! :)