“An illustration, it’s a bit like a drawing but with a name, which makes it sound more professional.
For example, in the margins of your schoolbooks, you draw pictures, not illustrations.
However, when you draw pictures to put in a book, they are called illustrations,
it’s the same thing, but it’s as if you had spent more time on it.
When you’re young, you’re told “Waow, you’re amazing at drawing!”
And once you’ve turned it into a job, you’re told “Waow… your illustrations are neat”…
In short, an illustration is like a drawing, but you sign it instead of forgetting it,
you sell it instead of giving it away and it gets framed instead of pinned down…
It’s a serious drawing, the drawing of an adult…
Did everyone get it, no one needs me to draw you a picture?!”