Sorry this is off topic for this thread: Just an example of using two different maps for skin that has tattoos and makeup. When you use the natural skin map for the redfilter and the tattoo map for the texture/color/SSS you preserve the reflection and SSS of the skin. The normal way people SSS is just plug the tattoo map into both and the result is that the tattoo/makeup part of the skin does not get the same reflection/SSS treatment that the rest of the skin gets. The normal way makes a tattoo look like paint ON TOP of the skin as apposed to ink that is under the skin. Have a look.

W10, Ryzen 5 1600x, 16Gb,RTX2060Super+GTX980, PP11, 11.3.740