Images, when added with a certain consideration, will help understand your article a lot. “A picture is worth a thousand words”. Yeah, well, probably not for Google, but it can for sure spice up a 1000 dull words, illustrate what you mean in a chart or data flow diagram, or simply make your social media efforts more attractive.
It’s a simple recommendation: use images to every article you write online. It’ll make it more appealing.