Create a realistic looking human face material for realtime engine (unity) for physically based shading

I have a high-poly model of a human head. It will be the "heart" of my unity driven teaching application (face reading). It will be represented in a HDR / IBL environment. I need help in generating all needed maps that will define the material: diffuse, specular, normal (and occlusion). Foto based maps will not work! The human is a "in-between" male and female of a non specific age, thus. For the most realistic look i need very detailed normal texture(s), showing the main 5 different types of pores in the parts: chin, cheekbones, forehead, nose and temple. Wrinkles need to be realized in a second normal map, especially around the eyes and lips. The diffuse map needs to show some specles and irregularities. All maps in 4K PNG and also as unmerged PS files (e.g. the specles as one layer). The model must not be modified.