on Just Publishing Advice:

Every writer needs to use images to promote their writing. It doesn’t matter if you are a blogger, article writer or an author.
But you don’t want to use stock images that are appearing so many times on a lot of websites and social media.
The best way to support your writing is to create and use unique images that will help you stand out from the crowd and improve your Google SEO.
But designing your own images can be time-consuming if you are not familiar with using Photoshop or Gimp. Luckily, there is an easier and much faster way and better still, it is free.