Without a doubt, these aren't Sunni Brown worthy doodles. They're clearly the work of students who haven't had a lot of experience or time developing their visual vocabulary. Instead, they reflect the type of visual work the students have been most often exposed to- graphic organizers. Only the first doodle departs from a traditional categorized\boxed\webbed map of ideas. But I suspect with time, the students, at least some of them, will begin to explore beyond.
Just today I assigned a large scale doodle of "Major Causes of the Civil War" as a 7th grade end-of-unit test. So the experiment of teaching continues.