I’ve been on flickr for a while now but I’ve been looking for a site that specifically relates to fashion photography.
Why not look for some fashion specific photography groups to join within flickr. Here are a few I found. Don’t forget to check out their discussion forums, where you can post questions and share tips.
http://www.flickr.com/groups/fashionphotographyaward/
http://www.flickr.com/groups/iconianews/
http://www.flickr.com/groups/bestoffashion/
http://www.flickr.com/groups/fashionphotography_ed/

The only place I can think of is
http://www.modelmayhem.com/
It’s a great place to get your work out there and possibly find potential models and fashion designer as well.
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