This is the palette I use for skin tones. It includes:
1. Normal skin tones from fair to dark skin, highlights and shadows
2. Cel-shade skin tones (greenish set) 
3. A black & white skin tone set that can also be for general use
Enjoy and have fun! <3
ArdisFoxx
        
                                        
1. Download the material
2. Go to Colour Set window open the options menu > 
3. Click Import Colour Set
4. Import from your Downloads material folder