I really don't think the source links part is used correctly. Direct links to the original image do NOT help with finding the artist's page. Especially if it's Pixiv because half the time it brings you to a "forbidden" screen. If you're going to link to the source, don't direct link. Link to the artist's PAGE, not the image of the picture uploaded. :/ And if you already know the artist's site, you could also add that into the tags. Either by "artist:name" or if it's pixiv and you can't read the name on the page or whatever, "artist:[pixiv_id_numberhere".