By this way you can give directions to your textures on organic models and can experience more effects by changing contrast , scale and adding new effects . It really works on my most personal work.
Below you can find my textures that was prepared for head.
3DTotal
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Glossy reflection map is bloody important for most cases cos if the face doesn’t glare in some parts it will look like a dead . You can see the highlight on Laetitia Casta’s eye and observe the life that it gives to her face.