Please this journal, so that a lot of people can read it.
I noticed that a lot of people don't know how to search for their photos on the internet, so here is a short tutorial. Unfortunately there isn't much you can do about art thieves, but i still think it is important to look out for them.
1. visit Google.com
2. Go to the page of the photo you want to search and click "show image"
3. Copy the Link and paste it into google.
4. This page should open, click "search by image".
5. Now you can browse trough the results.
6. The less results the happier you should be.
EDIT : You can also use websites like : tineye.com and iqdb.com
This was pointed out to me by some people, personally i have no experience with them, but i am sure that they work too.