Found this Flickr tip and think is quite useful..

Many members ask questions : whats her name on flickr? Etc..
How to find the original Flickr Photo URL and User from a Static Flickr Image URL/Permalink
Got a link like
http://farm3.static.flickr.com/2085/...8bcfaff9_m.jpg
And want to find out which user posted it, more images by that user, see the full-size version, etc?
From the URL you’ve got take extract the image name (
2177060015_258bcfaff9_m.jpg) and split it on the underscore. The first part is the photoID, the second part is the hash/salt and (if there) the third part the size (Full format:
photoId_
hash_
size.jpg).
Now append that photoId to
http://flickr.com/photo.gne?id= and *MAGIC* there you have it, the Original Flickr Photo URL (and the user) The example above would be transformed to
http://flickr.com/photo.gne?id=2177060015
Example:
Image name:
6553696609_d7a5ddefb9_b
http://flickr.com/photo.gne?id=6553696609
hxxp://www.flickr.com/photos/jalvaren/6553696609/ picture 1
hxxp://www.flickr.com/photos/jalvaren/with/6553696609 picture 2
Note: Removed one photo which was a rules violation. Please read and follow the forum rules.