I love the chewing face on your guy! It's really funny and well rendered. I have a question for you to consider about your story- The apples are supposed to keep the doctor away, but he has a set date for a doctor's appointment on the calendar already. He's already going, so the apples aren't keeping the doctor away.
Is it worth doing a thumbnail where your story is focused on the doctor? Maybe he's trying to hide the apples in the supermarket, or stop an apple shipment because the apples are causing him to lose all his patients.
I really like your idea!