By going into the texture editor and changeing the ambience setting on the part you want to changeNOTE MAKE SURE YOU HAVE THE RIGHT PART HIGHLIGHTED OR YOUR WHOLE MODEL WILL TURN TO THE COLORS YOU HAVE SET(BEEN THERE DONE THAT)you can also play with the diffusion settings to also try putting a light close to the character and turning off cast shadows then turn the color of the light to tan skin tone and there you have it tweak with the settings a little