As promised, here's some more process from the picture book.  This is some of the character development for Charlie's teacher.

From the start I envisioned her with hair that would take on a big, interesting shape.  At first I was thinking she'd be a red head, but I didn't want her to steal the show from another red haired character in the story.

I played with some other options.  I thought pig tails might be fun.

But in the end, the big shape stayed and I've decided to render her hair with graphite.  I think it will make for a nice contrast with the paint I'll be using in the finals.  (This last drawing of her is from one of the spreads from the book)