I understand but I think it shouldn't be that hard of a thing to do.
I don't think it's so much about difficulty but keeping it vague so that you can have a basic picture of what the person looks like without the need of hundreds of pages of description which could take away from pace or dialogue.
If you look back at the book's descriptions you'll usually find that each character has a main point drawn up about him. It'll be either the size of his nose, the colour of his eye, the fact that he's very fat or very thin.
In 'The Lord of the Flies' that's how it happens. Piggy is fat and has glasses. The bad guy is ginger and lanky. Simon has black hair. The main character has barely developed past infancy. (AKA: he looks about 8-10)
If you look back at the book's descriptions you'll usually find that each character has a main point drawn up about him. It'll be either the size of his nose, the colour of his eye, the fact that he's very fat or very thin.
In 'The Lord of the Flies' that's how it happens. Piggy is fat and has glasses. The bad guy is ginger and lanky. Simon has black hair. The main character has barely developed past infancy. (AKA: he looks about 8-10)