I see you are new to DA (welcome!) so you may not yet understand some of the site rules. Posting art that you did not fully create yourself is considered Art Theft. It is okay to post fan art or be a fan of someone else's art, but if you want to post something you did not fully make, please use Photobucket.
Current deviantART policy considers copyright infringement to be any situation where a user takes the original art, photography, or writing of another person (a 'third party') and then either misrepresents the original, unaltered work as one of their own creations or includes the work (either altered or unaltered) in a new image or piece of literature without the proper permission of the copyright owner.
[link]Because DA gives every piece you submit it's own copyright, you are claiming a copyright on someone else's already copyrighted material.