How to add preview image to the order confirmation mail

Hi!

We sometimes have customers contacting us complaining that the design / picture we printed is not similar to the one they designed, so we would like to add a preview picture to the order confirmation mail as in most cases, we suspect people simply can't remember the submitted design.

So far, while WC actually shows a preview picture in the checkout (step 2), the picture added to the order confirmation only shows the general item picture but not the one the customer designed.

Is there a way to either attach the preview image or to reply the general item picture with the one designed by the customer in the order confirmation?

Thanks

Alex