I think giving General Jinjur a kind face in the last panel makes what she says much more disturbing than if I gave her a cruel face. She has no idea that she's saying anything upsetting.

She gets pretty vile while insisting she's not wicked in the original book:

“You see how foolish it is to oppose a woman’s wit,” said Jinjur, gaily; “and this event only proves that I am more fit to rule the Emerald City than a Scarecrow. I bear you no ill will, I assure you; but lest you should prove troublesome to me in the future I shall order you all to be destroyed. That is, all except the boy, who belongs to old Mombi and must be restored to her keeping. The rest of you are not human, and therefore it will not be wicked to demolish you. The Saw-Horse and the Pumpkinhead’s body I will have chopped up for kindling-wood; and the pumpkin shall be made into tarts. The Scarecrow will do nicely to start a bonfire, and the tin man can be cut into small pieces and fed to the goats. As for this immense Woggle-Bug—”

“Highly Magnified, if you please!” interrupted the insect.

“I think I will ask the cook to make green-turtle soup of you,” continued the Queen, reflectively.