I don`t think there really has to be a torrent tracker for photos, that is because you can simply browse the internet and download any photo you want . And downloading a single picture, assuming reasonable modem speeds, takes less time than downloading a torrent and opening it up in your torrent client.



Still, you can find photographies on some trackers like:

Tracker Link	Tracker Description
RuTracker	RuTracker has a photography section.
cgpeers	You can find photography tutorials, and some stock photos
gfxpeers	Similar to cgpeers
filelist.ro	It has about 731 torrent photographies(a few tens of thousands of photos)
myanonamouse	It has tutorials and pictures
TPB	You can literally find anything here
IPTorrents	A few thousand pictures
bitspyder	It has a section of art and photography

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There are a few trackers, but I think the most effective method is to download photos from the internet.