Creating infographic is not just about data. It is also an art through adding a compelling design, shapes and images for better comprehension. In addition, a good infographic has beautiful visuals and reliable data. This will help users understand and probably share it on social media, link to their website or promote it via email.
On the other hand, after you collected data and started creating an infographic, you also need images, vectors or illustrations to make a compelling infographic design.
So, I have collected some of the few free illustrations with Public Domain license free for commercial use.