I am ready to paint the bare back of a Caucasian woman in the Russian sun in Summer.  I have primed in black and have craft paints in 3 shades of flesh and neutrals to shade.   In addition,  I have a set of Vallejo paints with flesh colors and contrasts.  Can you advise on technique to do base, a couple of darker shades and a couple of highlights.   I would appreciate any advice or suggestions!

thanks, Leddy