When I took a forensics course on line a few years back, we learned that most of the anthropological characteristics they look for are statistical. They look at the length of a shin bone and can extrapolate an eighty- or ninety percent chance of the person being in a certain height range. They can look at the shape of the eye sockets in the skull and conclude the skull likely belonged to somebody of Asian or African or European ancestry.
This article has a bit about it
Identifying the ethnicity of a skull (Aside: looks like an interesting free course)
But that doesn't take into account a situation like Dawn's, where the face was so extensively damaged. The broken bones must have been like trying to put a jigsaw puzzle back together.