She used natural or 'ambient light' as she was self taught and didn’t know how to use flash! Excellent pictures, concentrating on the person, their environment, her connection to them at the time. The images are about who the subject were at the time rather than just concentrating on techniques. This often, as this case makes for a more interesting portrait. They look human!
Great image of Clive James resembling Jack Nicholson in ‘One Flew Over the Cuckoo's Nest.'