There's a knack to available light portraiture, back in the mid 70's I made a living doing them. It's not difficult but it is intuitive, I started when a friend asked me to shoot portraits of him and his 3 sisters for their parents as a Silver wedding present. For about 2 years I shot hundreds of commercial shoots, then changed direction entirely.
I have to admit that I lost the knack, once I began using studio flash and shooting commercial work I lost enthusiasm for available light portraits. I guess I got lazy.
So I have a lot of respect for photographers like Cheryl jacobs and Nicole, and I raelly enjoy seeing & looking at their images. I don't want to go back - landscape photography is what I enjoy shooting most now and I still shoot rock bands live for a record label but unfortunately no longer with film.