Infographics are graphical works used to illustrate some set of data.
According to the handy dictionary that ships with OS X, the word illustrate originated in “early 16th cent. (in the sense [illuminate, shed light on] ): from Latin illustrat– ‘lit up,’ from the verb illustrare, from in– ‘upon’ +lustrare ‘illuminate.’
So a good infographic, or any good illustration is one that ‘sheds light on’ the words that accompany it.
If you are in the business of making infographics and think that the word illustrate means “to draw pictures around”, stop now. In your own little way, you are hurting the world of knowledge.