When creating emails, keep in mind that in many contact's email account they won't display images. For example:
Is the recipient opening the email in Gmail? If so, Gmail's system automatically blocks all images until the user clicks on a "Display Images" link.
In Outlook, the recipient may have disabled images by default.
In either case, you won't have control over "forcing" a recipient's system to show your images. Because of this, you may want to reconsider using an email that is reliant on images.