The only thing I have found, WP wise, about image captions and crediting is at http://en.wikipedia.org/wiki/Wikipedia:Captions#Tips_for_describing_pictures. There is no hard or fast rule about it, but I removed cases in the past of people who put themselves in the image captions to demand credit.

Regards,

Zachary Harden, Eagle Scout (BSA)
Oceanside, California, United States
-------------------------------------
Flags of the World Editor: BY and MD
Corresponsal/Correspondent - VENEZIMBOL


> Date: Fri, 24 Aug 2007 21:21:08 +0100
> From: dgerard@gmail.com
> To: wikien-l@lists.wikimedia.org; commons-l@lists.wikimedia.org
> Subject: [Commons-l] Making damn sure image attribution is very clear
>
> http://duncandavidson.com/archives/564
>
> I responded:
>
> "My apologies on behalf of Wikipedia and Wikimedia! I've emailed to
> wikien-l and commons-l about this post, asking for suggestions on how
> we can do better on this sort of thing. There's an editorial habit on
> English Wikipedia of not putting attributions on photos in the
> articles themselves, leaving that to the image page ... I think that's
> a matter for discussion as well."
>
>
> I think we have to do better on this, at least in some way. The image
> page needs a BIG OBVIOUS CC notice. Many do, but some don't.
>
>
> - d.
>
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