Realistic texturing question



I’ve started a model with intention to make a realistic skin textured real-time character. I’ve went through several break downs to do so but got lost in the different processes and got several questions in the process of learning them.

Like in terms of setting displacement maps of texturing XYZ packages, when it differs when you apply them for a pre-rendered and real-time rendered model ?

i’ve also wanted to know the difference regarding realistic skin maps making in both marmoset and UE4

here’s the characters and the topics i went through that has the quality that i want to achieve!

Thank you so much