Today someone told me that someone is using my work as his/her .I visited the gallery and i recognized one more photo from another artist
So the art thief is and the work i recognized is  and the original is this one and also this and the original is here

Check out the thief's gallery and report him/her as well

UPDATE 03/05/13

So after a month i contacted the deviantart help desk telling them that there is a thief that we brought to your attention and you did nothing ,why is that?This is there official answer

"We appreciate that you have brought this to our attention, deviantART customer service can only accept claims of infringement which meet the requirements under the law which means they must be filed with us by the actual copyright owner of the infringed work or by their legally authorized representative. Since you are not the owner or an authorized representative we cannot act on your ticket, so we will be marking it as "Solved" to clear it from the queue even though the issue really hasn't been addressed.

It would be best if you could contact and inform the actual copyright owner(s) so that they can file a valid claim with us if they so choose.

While you cannot file a valid claim of copyright infringement in this particular case, as a member of deviantART you are able to use the Moderation system which can be accessed by clicking the 'Report Deviation' link found on every deviation page in order to point out to our staff that there may be permissions issues with certain deviations, but please understand that these Moderation reports will not be treated as a valid claim of infringement and will not receive the same type of response or attention."

Have in mind that one of the stolen deviations was mine but   NO ONE was bothered to look ,so i suppose there is a tolerance towards thiefs in this site..Disappointing to say the least..