Katie,
is there a particular story from the ones recommended here that you think will appeal to your class?
The reference picture I like for the solar system is this page:
https://science.nasa.gov/solar-system/planets/
compare it to this one: https://www.esa.int/kids/en/learn/Our_Universe/Planets_and_moons/The_Solar_System_and_its_planets
https://www.esa.int/ESA_Multimedia/Images/2014/08/Explore_our_Universe_poster which you can download and use.
You could add a nice reflection here on how much detail is needed to show a planet.