hi man i truly love your work and wish u have a dd, and i want to suggest a DD from this series but u don't provide stock credits in your artists' comment, so please give credits even if they were your own photos or purchased one
still u need to declare that in your artist comment . i told u even if they were your own. they just want to make sure it is from a legitimate source . FAQ #217:What are "Stock and Resources" and can I use them in my submissions? a quote from one of the dd selectors journal :"Credit must be provided to stock artists, and stock must be from legitimate sources (i.e., not Google)"
You dont have to provide credit to stock houses/companies, only individual artists, in this case it does not apply. Especially to stock photographers or artists who sell their work exclusively with one stock house and use them as a sole vendor. You can quote the source but wouldn't be able to quote the photographer as it is done through them. I can understand if it was from deviantart stock, or another stock website that relies on that of system though, and if I did I would credit them of course