You can use the Attachment Image component even with Sobjects that don't normally have a image field, because you can add custom fields, including image fields, to any Sobject. Go to Setup > App Setup > [Sobject] > Fields > New > Lookup Relationship > Image > Name field > Next >>> Uncheck Add Related List and Append Related List > Save.
Back in the Page Editor, add your image lookup field (e.g. "photo_c") and click on the related fields icon (with the green arrow):
Next, in the related image fields, select the Attachment Id field:
Then, go back to the Attachment Image Properties and set it to your custom image field.