You can include a picture to the Confirmation Messages.
1. Upload the picture file:
- in your website, and make sure it is accessible, for example from a link similar to https://www.yoursite.com/image.jpg, or
- use a website where you can host images for free - for example, https://postimage.org
2. In the Description field of the Confirmation Message, click on the HTML button
3. Type: <img src="https://www.yoursite.com/image.jpg" width="200" height="100"/> (replace 200 and 100 with the correct dimensions of your image. Please note specifying dimensions is important for the correct resizing of the widget page). Also it is recommended to use https:// (if available in your web site) in order to avoid security warnings from some browsers.
4. Click on Update