Sending images in automated workflow

I have appointment confirmation emails that are send via a workflow. I am sending a message only:

{{Name}}, We are confirming your appointment on {{Install Date}}, location is {{Address}}. Your Representatives are {{Installer}}, {{Jose}}, {{Erik}}. If you are unable to keep your appointment call us at 508-297-2900 to reschedule. A cancellation fee will be assessed without 24 hours notice.

I also want to include pictures of the service person who is coming to the appointment. I have 2 columns with each persons images in there. If I added the columns to the email it only sends image.jpg but not the picture. I tried to send the email with message and links to the columns but it sends nothing.

Answers