Earwig and the Witch by Diana Wynne Jones

Most orphanages are horrible, but Earwig has a surprising amount of power over everyone at St Morwald’s Home for Children, and loves it there. The last thing she wants is to be adopted by the very strange Bella Yaga, demon-attended Mandrake, and talking black cat Thomas. Earwig wants to learn magic, but will need all her ingenuity and help from a familiar to survive. Expressive big eyes, twisty mouths, on stick figures flesh out the characters, action, and ravens and spiders adorn the margins.