Thanks for all of your comments, it is a very valueable thing for me.
some answers:
Kisifer & Blind Pew: I mixed the oil paints (Talens) burnt siena, titanium white and raw umber. From these colours i gain a many tones which i bring on the face.
Then i grind it softly.
Hyades & BESPJL: The formula is the same like with the face paintning. Firstly i paint the bright - grey base (Humbrol or acryl). From the white and black oil paints i gain a few tones. Then i bring it on the figure and i make a shadows.
Ernest: Thanks for your kind words, my friend. What's next on your workbench?
Wojtek: To paint the base i use humbrols or acrylics and final color and shadows i gain with oils .
best regards
Artur