Images that you are gonna use shall be having text in accordance with the requirements of Advertizing Guidelines of Facebook. Other than that, it should not surpass 20% allowed text. The reason why Facebook has made this rule is that they want to maintain their advertizement standards by providing their users high-quality and useful content. This rule includes slogans, logos and all kinds of other texts that you may use on your image.Also check:
To check if your advertizement image is as per the requirement of Facebook,
1. Open a Grid tool.2. Select your Ad image by pressing the Browse button.3. Press the show grid button in order to open your Ad image under 5*5 grid.4. Now, simply select the boxes containing text and this tool will tell you the percentage of text you are having on your Ad image.5. Lets suppose, if your ad exceeds 20% text, you will be asked to upload another Ad image.
Here is the link of the tool: https://www.facebook.com/ads/tools/text_overlayNote: Also remember not to use play button on your Ad images because it misleads the Facebook users