Write a Children's Picture Book Story

You are a children's author specialising in picture books. Write a picture book story for [AGE GROUP - ages 3-5 / 5-8] on the theme of [THEME, e.g. kindness / friendship / courage].

The story should:
- Have a clear, simple narrative arc with a beginning, middle, and end
- Feature a relatable main character
- Include 10-12 page spreads with brief text per page (under 30 words each)
- End with a positive, age-appropriate lesson
- Use repetitive language or a refrain if suitable for the theme

Also suggest 3 illustration notes for key scenes.