I'm commenting just to show my support from the whole Snooki Fiasco. It's incredible and disheartening to see how many fail to understand why that sort of thing isn't ok. But then...they are also Snooki fans. Hope you get the compensation you deserve.
Well its a tough lesson but the internet is a free for all unfortunately.. frankly it's better that occasionally this kind of BS happens then having it locked up tight and regulated (which is what the large cable and telecom companies are pushing for). Great pic, good talent, no excuse for some so called professional to rip off your work but if you want to keep these things close to your chest then watermarks may be an option. Good luck!
About the Snooki thing: below are some resources for you. The US takes the Digital Millennium Copyright Act VERY seriously, so the odds are in your favor. You will most likely go through the DMCA notification process because DeviantART and Facebook are American companies. I'm not familiar with Croatian copyright and intellectual property laws, but it's not likely that you'll have to use them in this case. If you find out that DMCA doesn't apply to you, then you will definitely have to refer to other Croatians for advice.
In the unlikely event that the situation escalates into a legal battle, then it will be in your best interest to hire a lawyer and take it to the American legal system. In that case it's pretty likely that you will win and be repayed for damages, so don't fret over paying a lawyer (definitely discuss it with them, at least. Getting real legal advice is worth more than a random internet stranger's). It probably won't go that far but it's good to be prepared. I suspect Snooki's agents have enough brain cells to be scared off by a takedown notice.
As others have said on imgur, you have inherent Copyright under the Berne Convention and Snooki's promotional material is not fair use. On top of that, you can prove that you are the creator of the work. If you want make sure this stays under control or can't happen again, you should register your work with the Croatian or US Copyright Office (you don't have to be American for us to have a record of your work). Any registered work will have a better chance in court than one that isn't. www.copyright.gov/help/faq/faq…