As a fellow artist (don't do portraits though - that's a totally different level of difficulty in terms of pure skill) - that is just awesome, masterfully done.
The most difficult thing with portraits is to capture the true difficult to describe "aliveness" of not only A human being, but a particular one that has their own micro-expressions, look and different nature that is a compilation of a million tiny wrinkles and shades on the human face, It's unimaginably difficult, and I'm a decently skilled semi pro artist myself saying that so that the ordinary guy understands what the value is.
And it's at least a month or two (depending on artist) of hard work to produce such a work . . . the best can do it faster but it's really incredible work.
Kudos to her! She deserves the fame