Hi Francisco
Check this one out too. Please make sure you watch part 1 AND 2 (part 1 for the acrylic base coat, part 2 for the actual oil painting of the face)
I tried this method on my recent 54 mm figure for the first time, and I am quite happy with the results, although I do need a touch-up here and there. I will hopefully post my WIP here soon
Benny