It seems to me whatever technique you used to "smooth" the skin actually
just intensified (or sharpened) the skin texture to an extreme (without much actual correction). This is bound to happen when bandpassing or inverted high pass techniques, etc., are used as the sole process at or near the same frequency on the entire image.
It also intensified the specular highlights in the fly aways on the hair which you would actually want to minimize and/or remove completely.
I would research more into dodging and burning techniques and try to not focus just on the texture of the skin but the tones, dimension/shape, lighting, etc.