Physical description of Granny WeatherWax

Hello, I'm looking for some help: I need to find every piece of physical description of Granny WeatherWax to make a drawing of her... I know there are official pieces and lots of fanart but I also need direct quotes as some sort of caption. Can someone help? I'm looking through every book I own with her in it but I'm not finding much... Dis she ever get a detailed description, even?