Managed to get the first two highlight colors (or one in the case of the black beards) done. I think the brown (first file), reddish (fourth file) and blonde (third file) are looking pretty well done. They may need another step after I highlight the rest of the areas of the models and there isn't as much contrast. The grey and black beards will need one more highlight each before I think I will be happy with them. Yay progress!