Yes and no. In The Traveler's Daughter, Bria's character is very much informed by her looks. She basically should have been given to another people to raise, a people who resembles her more closely, but her goddess had other ideas for her. Hence she has a childhood and adolescence along The Ugly Duckling lines.
In To Be Undone, characters have different physiques according to their castes, but apart from a minor thing, appearance doesn't play a major role.
Apart from having a physical type clear in my mind, I couldn't tell you what most of my characters in Witherwilds look like. Shocking, I know.