Please read the proposal below. It would make it obvious to determine if images are input or output images, and if their processing is in progress or finished.
User has to select an image and look outside of the browser to display active customisations, if any: In the customization palette and the “reinitialize” control is highlighted. The information is displayed for the active image only.
A graphical interface in the browser showing image customization would be helpful, one indicator per thumbnail.