You'll want to use the getInfo method, documented here: http://www.flickr.com/services/api/flickr.photos.getInfo.html
Once you know the id of the photo that you wish to get information about, you make a call to a url like this:
http://api.flickr.com/services/rest/?method=flickr.photos.getInfo&api_key=bfaa37fbd00c1291ced65b903fb15fda&photo_id=6128750894&format=rest
Then just parse the resulting XML file (see the example sketches for how to do this).
EDIT: See this page for documentation for all the flickr api methods: http://www.flickr.com/services/api/
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