|You haven't said what email client you use or what (if any) error messages you get.|
All that is relevant & essential information if you want any meaningful help.
Anyway, if it's Windows Mail, by default the displaying of images in attachments is disabled for your security.
You need to open Windows Mail, click "Tools > Options".
Click the "Security" tab.
UNTICK these two options:
"Do not allow attachments to be saved or opened that could potentially be a virus"
"Block images & other external content in HTML e-mail"
Before unticking those options it is advisable to have a reputable antivirus package installed which includes an email-scanning component.