A graphical explanation of stationary waves. AQA Physics HELP!

I'm not quite sure what AQA want. Does anyone have any graphs that can be used to explain stationary waves?

Here is what a mark scheme says

Ah, I'm fine with describing how a stationary wave is formed... However when they want you to include a diagram, I'm not sure what to draw.
What I draw normally is an incident wave striking an object and reflecting and its reflection superposes...then I label the positions on the wave but I'm not sure if thats "appropriate" and what AQA want