The first one I did of my project to doodle sketch every Discworld Character. This one is Lady Sybil. For her I went a lot by the description from Guards Guards, notably lack of hair and eyebrows (from raising dragons) which goes unmentioned often. I also used the established fact that Ankh-Morpork and Discworld in general doesn't have as strong an established idea of race as Roundworld does (because it's hard to focus on difference between brown and pink when there's those green bastards over there!).