The eprint settings page should allow for you to specify whether or not photos should be printed on photo paper, or default to normal paper when sent via eprint.
For instance, My Fiance is on vacation right now. She keeps taking pictures on her iphone using the normal iphone photo app. After taking the picture, she chooses send-to -> email -> my eprint email address. When the printer receives the email she sent, it forces it to print on photo paper. That is a complete waste of expesive paper. In cases like this, where she's sending funny pictures to my blah@hpeprint.com email, I should have the option to specify "print pictures on normal paper" or "print pictures on photo paper"