thanks all for the kind words.
@Pedro, the fleshtonemix is "traditionnal":
base: titanium white, burnt sienna, crimson alizarin hue and flesh tone (brand "louvre")
shadows: van dyck brown, crimson alzarin hue in many layers
highlights: neapel yellox redish, and the high highlights neapel yellow hell
the undercoat for this time is not white but humbrol green 66.
have a good day
Christian