Do you have to? No. 

Do we recommend that? Yes.


It's recommended to upload a picture with your blog post for a few reasons:


  • Improve your blog message.
  • Make your blog more appealing to readers.
  • Improve our main blog cards. 
This is a blog on Yoast.com to show you some best practices to post pictures on your blog posts.


Also you can see this example for one of our blogs on Naturist Blog.