I have to disagree with some of the opinions here. texture and bump maps need to be made from photographs of real skin. If not, then your figure will look painterly or like a doll instead of a person. I can tell right away when I see hand painted skin. If your goal is a painterly look then that is fine, just don't expect photorealism out of it. Those disembodied heads all have textures derived from photos of the person that was digitally scanned for the mesh if I'm not mistaken. I use this texture from Maelwenn all the time with different eyebrows. This is a good example of a texture map from photos. Also, if you over-work a photo based texture in Photoshop it will start to look like plastic and ruin the effect.

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