ok as I saw that you had started, you are using a one point perspective, this is good, but your characters do not match that perspective, the angle needs to be lower on the background perspective.
I made the perspective lines a brite red so ther easy to see and I circled the feet. you got to make the feet match the perspective you have layed out, but it might make your characters look like there leaning back. it would most likely be easier to just redo the background with a much lower perspective.
in simpler terms move the horizon line down on your next background. move it until it is close to the crashers thy.