My first thought was to focus on shot 2, because that had the most interesting scenery layout, because some of it is in front of some parts of the screen the character passes through, so you'd have something slightly interesting with dealing with that.
But then I heard we were supposed to pick a shot that had both characters in it. I figured the most interesting poses when both characters are on screen were on the 2nd panel of shot 11, and so doodled that. I didn't order the images in terms of what their layering would be, but fixing it felt unnecessary as it seemed fairly obvious that the characters would be in front.
I'm still unsure which one I want to go with, so drawing up a detailed pencil draft of the backgrounds, I decided to try both: