The breeding hints "text" should all be available unless the dragon cannot be bred with it now. But the images are not always done right away and sometimes still missing after a long time - it doesn't happen much nowadays with many users helping, but yes there are still some waiting to be uploaded.
The breeding hint image is kind of 'standard', i.e. the placeholder is added even if the image doesn't exist yet, and you can see the expected filename so you can upload an image using that name and it'll automatically show up.
(Or, you can provide it in the corresponding dragon's page's comment, so if nobody processes it others may still see it.)
P.s. In the case of Iden, the image is already done.