I remember that series, they sold well

(Yes, the Ducks sold books until 2000)
One of the thing the folk who bought (paper) books like that wanted, was the ability to make scaled copies (usually, bigger, but maintaining Aspect).
You might consider using a Word processor (for the text) and use Sigil / Calibre to place the images (

Put a place holder Tag into the text. Image 43 here)