Add Mock ups as an available column when reporting on Features

We are trying to enforce change management needs by requiring production changes have a screen shot of the new / edited feature. We are doing this at the Feature artifact by asking our users to ensure the Feature has this prior to updating the Feature Status to Ready to Ship. We are using the mockup feature, so that we can take advantage of the native versioning.

I am trying to develop a report that would expose Features that do not have screen shots to enforce the new change management step.