Ideally, the art should match a key word or phrase in the slide. That's because this is a phrase that needs explanation. Be careful when using abbreviations, acronyms, and special phrases on your slides. When making your presentation, you must be sure to explain what these mean to the audience. Otherwise you run the risk of losing them.
Most people do.
That's why it's important to explain how to read your charts as soon as you put them on the screen. If you say something important during the first 10 seconds of showing the chart, people won't listen because they're too busy trying to figure out how to read what you've shown them. Note the placement of the clip art. When using clip art, keep the images balanced. Also, remember the rule of thirds.