In the media section you’ll decide on the image that you want to use in your ad. The recommended size for this image is 1080 pixels by 1080 pixels. (Though this would depend on your ad placements) The image MUST contain LESS THAN 20% text! (If you plan on using text in your image, Facebook has a very cool tool that will help you work around the 20% text overlay rule)
Carousel Ads contain a series of images or videos that users can rotate through, all of them helping to describe a single product, service, or event the ad is promoting. Each Carousel Ad can contain to 10 images or videos at a time and link to their own individual webpages. Because these ads carry so much media, according to Facebook, they're ideal for: How to Write Facebook Ads That Convert in 2019
This type of ad appears directly in a user's News Feed when they access Facebook on a desktop computer, and it looks more like native advertising. In our experience, these ads have a higher engagement rate than right column ads, but they can also be more expensive. These ads must follow organic Facebook posts best practices and be both engaging and visual.
It's visual. The picture alone is worth a thousand words about how much fun this concert would be. Not only is it on the beach, it was also taken on a gorgeous day and the stage looks amazing. Also, it clearly represents what to expect during the event, and it catches the eye as someone scrolls through their News Feed. (The beautiful ocean water definitely helps.) Facebook Marketing For Individuals - How to succeed With Facebook Marketing