Social media, for most authors, is the primary means of advertising, marketing, and connecting with readers. A majority of authors start wit the basic needs–a banner image on Facebook and/or a website and use of their book covers.
But there are so many more options for what you can do with images in social media. For example, do you create custom, related images for your blog posts or most important social media posts? All current research shows that posts on social media which include graphics get a higher engagement than those which don’t.
Here are just a few ideas of different images you might want to try using on social media:
Banners are the long/skinny images that go across the top of your Facebook, Twitter, Google+, website, or other platforms. Sometimes a website has multiple banners, one across the top and one or more on the home page or at the top of each main page. Typically, you want these images to include your logo and/or website. They can also be used to announce/advertise the most important upcoming dates for you as an author (usually new releases).
These image can include more detailed graphics for paid online or print magazine ads. They can also be ads on other websites or in newsletters. This means they come in a wide range of sizes and needs.
Use images–usually on Facebook or Twitter–to announce anything from new releases to sales to book signings and so forth. Images will always engage more than just text for these announcements.
Memes are usually just for fun–funny comments on being an author, what you feel like without coffee in the morning, etc. They can also help catch the attention of new readers for your books. Make a meme which has an image of your heroine and a quote from the book, or the cover with the tagline.
Always try to have an image that helps grab attention when you post on your blog. Usually, an image which includes the catchy title of the blog post is a great place to started. Other images which illustrate whatever the topic is are also good.
There are a ton of other ways to use imagery when posting on social media. Hopefully these gave you a few new things to think about.
By the way, there is a fantastic page at Make a Website Hub which shows the recommended image dimensions (as of 2016) for various social media needs.