Data Recovery

Hope y'all don't have to make use of this.

http://www.datadoctor.org

Have you put other files or data in the same place where the file was stored? If you did, the previous data may be overwritten, and it would be hard to retrieve them.
Anyway you can try some data recovery software, and there is an article about how to get back deleted photos:
http://www.disk-utilities.com/articles/how-to-get-back-deleted-photos.html
You can have a look at that..

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