e.g. a sketch, a diagram
The Drawing serves two main purposes:
Firstly, by giving visual form and structure to the Object it can shape the way the story is told. Looking at the Drawing, especially any key details the player has chosen to highlight, can inspire or influence events in the story introduced by other sources.
It’s worth explicitly telling players that they should not aim to create art with their Drawing. It can be intimidating to be asked to draw, even just for yourself, and it’s not supposed to be the focus of the game. Of course, they are free to get carried away with it, but giving players permission to sketch something simple makes the experience more accessible.