Materials can be tricky, you should be using a combination of the material settings and spec map to help push your material definition. Typically studios have their own proprietary realtime shaders so there is never "one perfect way" to set everything up. However, you in particular have a benefit that you are working in…
I apologize in advance as this will be lengthy, please note that my goal is to help you get a better understanding on where you could improve and how. I'm going to break it down first as what areas need work and then go into detail exactly why these things are bad or good -Highpoly/anatomy -Lowpoly -UVs -Texture HIGHPOLY…