Does it mean :
- Big chin(area of chin is huge)?
- Chubby face?
- Strong and noticeable jaw line?
When used in a book, does it in certain way means the girl is not so good looking? The usage from Rowling in this case is definitely not describing someone beautiful.
A lantern came swinging towards Harry and by its light he saw the prominent chin and severe haircut of Professor Grubbly-Plank, the witch who had taken over Hagrid's Care of Magical Creatures lessons for a while the previous year.