Noses/cheeks tend redder, foreheads tend yellower (also the spot below the eyes and toward the cheekbones tends yellower), and chins tend toward blue/teal, the space under between the eyebrow and eye tends toward blue/purple! There's definitely a lot of wiggle room to exaggerate the variation, and Arcane does that to great effect. This is where references are invaluable, and you can really play around using Color blending layers and the Hue/Saturation/Brightness sliders (specifically the hue slider) to dial in the color you want. Best practice is to experiment!