The upload process requires the user to select a 'category' (Game/Creative/People). Is this not visible to Moderators? Should not the Moderators have already been alert to rejecting images incorrectly classified?
So sending it to them again does not strike me as an effective way to make a correction.
a) it is not required. A lot of images are submitted without a category selected.
b) The category is often overlooked so it seems. If you emphasize that the image should be evaluated especially for the purpose of determining the correct category, this won't happen.
c) If the submitters re-upload images to get through Geekmod why not Geekmod it a second time if the category was incorrect?