I can tell you from experience, and this may differ from state-to-state and person-to-person, but everything in the drawing is almost void but color when being analyzed by a trained therapist (inside a school setting.) Of course, things like genitalia, violence and the such is looked at, but for the most part they will straight at color first - and deeply.
I had an episode of genitalia drawings, and it was brought up, but what wasn't mentioned was that the class had JUST gone to the Science center, and they walked by an exhibit showing things like this.
It was the color that he used in the drawing that caused the "problem."
Also, people keep saying that the sun looks like certain things, and it could be, but if this was made in school I can almost say for certain it was made after reading a book.....
This is how teaching is fun for children, and how you keep their attention in the classroom.
I am just trying to give my personal experience, which I think could help in this area because Lord knows I have spent my time trying to take it all in. Maybe I can help sharing it with you.