Facebook Sharing Debugger Tool:
https://developers.facebook.com/tools/debug/sharing/
Facebook crawls the DreamHorse site regularly for new photos but you can speed up the process! The first time you share a link to your DreamHorse Photo ad on Facebook, it might show a generic banner as your photo. Subsequently, Facebook should show the horse photo from your ad.
Once your order is completed and the final photo is being displayed on your ad, you can force Facebook to “SCRAPE” your ad and display the current photo on your DreamHorse Photo Ad immediately: