According to rules page on datacards
“ 4/ Custom Datacard Images
Datacards can have custom images purchased for them so they produce the custom image instead of the default. Once set, you have the option of turning the image on and off for production via the production menu. There is a one time fee to set a custom datacard image of 5% of the Raw Material Price (RMP) of the entity on the datacard, with a minimum of 2,000credits. Both regular and large images can be set, and all images are reviewed by the art team before approval. The form to set an image is located under the "Assign Datacard" form ”
And Also Rules page for Production
“ 1.2.7/ Custom Datacard Image
You have the option of assigning a custom image to the datacards you own. There is no need to retool or otherwise alter the production process when the image is accepted. Once set, any entities produced with that datacard will have the custom image set for it instead of the standard image. When adding a project to the queue, or editing one that hasn't yet started, you may choose to use the default image instead of your custom image. For more information, see Datacards: Custom Datacard Images ”
Unless this has not been implemented or is a Public custom Image not 'custom' ??