Ответили кому нибудь что то вразумительное.
Мне прислали такой ответ.
When submitting scans of illustrations or artwork that was not created digitally, you must submit a property release. NON-DIGITAL illustrations include any artwork that has been scanned or photographed, such as pen and ink drawings, paintings, watercolors, and engravings.
Property releases for non-digital artwork must include a thumbnail image of the artwork on the release.
For DIGITAL illustrations, you will need a reference image! A reference image is a photo, sketch or artwork on which the illustration you are submitting is directly based. If your illustration was created based on another image, you must attach the original as a reference image.
You must own the copyright to the original reference image. You cannot submit illustrations that are based on images to which you do not own copyright, such as free images from the internet or public domain.
Submitting Illustrations: A guide to reference images and property release requirements: