Didn’t this image draw your attention?
Thats exactly why you should use them! Try to include as much graphical content in your content as possible. There are some rules tough, try to get images with colors that match your current theme. Also, never use blinking images or images with very intense colors as these scare people away, rather from drawing their attention. If you are not quite an graphics artist you could search for related images on the internet! The image will draw attention and interest upon visitors. Which will be more likely to read your content, resulting in more conversions, revenue and subscriptions in return! A big part of blog promotion is done trough graphics and layout. If you get your layout right you will be one step ahead of any other blogger!