Until the day we have several such recognitions (maybe some by relatives, friends)we won't know how accurate they are. Like reconstructions based on bones and skull, i would think they're pretty generic. Unless DNA readings she uses include a great deal of detail (not all do, and the most detailed are more expensive, i think) skin tone and facial features basically guess work.
That would be especially true if the person was mixed race, and the & of each close to equal.
But my big question is why do it? I'd love to know the oiht process that motivated this artist to take this path?