There are a few different factors that could impact why your images aren't displayed in your email. It is important for images to display properly because Opens are calculated based on how many of your contacts load the images in your email.
Images are blocked: It’s possible that the email client has blocked images from loading.
This won’t change until the recipient clicks always display or adds you to their Safe Senders, Contact list or Address book. Be sure to communicate this information to your contacts!
Include text (not just images) in your email: Image-only emails will not open properly and will be flagged as spam nearly 100% of the time.
Anti-spam law dictates that all emails must contain some form of text (at least 400 characters), but you should aim to always include more text than images.
Make sure you are using absolute URLs: Relative URLs won't reliably display for your audience.
Relative URLs (
/image.jpg
) are the equivalent of giving someone directions saying “down the road, left-hand side, walk for a few houses, you can’t miss it.”Absolute URLs (
http://www.mydummyaccount.com/images/image.jpg
) are the equivalent of saying “31 Emily Street, Chicago, Illinois, USA, North America, Planet Earth” instead.In order for everyone to be able to see your images, you need to use the absolute URL and make sure the images are stored somewhere publically accessible.
Background images don’t show up on certain email clients: Always use a solid background color as a backup.