You or your opponent might be asserting that a physician has undermedicated a heart patient over time, leading to cardiac arrest. Cause and effect illustrations generally require sufficient data to demonstrate trends before or after an event. A visual aid can assist a confused jury as they try to sort out scientific evidence from hyperbole and junk science. One three-panel visual presentation with a minimum of text would strongly support such a contention. Avoid the use of chart junk and garish colors.
Clip art is a distraction from good data.
Questionable data and poor data presentations are often augmented by the use of colorful icons that are supposed to give the data validity. If the data set from which your illustration was created is good, then it will need no enhancements, provided the presentation is compelling. Garish colors do not make a presentation more effective. Red should be used sparingly, as its connotation and impact vary from juror to juror. A simple rule to follow in illustrative design is to use the smallest possible color difference to get the job done.