Doesnt matter if you didnt say its yours, you didnt say its not, you didnt link back to the original artist, therefore : youve implied its yours, but, its stolen, and what others have said, this isnt tumblr, photobucket or anything like that, DeviantArt is a community Of and FOR Artists . . . its not a place for you to put stuff you like.
When signing up for new webistes like this, read the terms and conditions, actually Read them, dont just scroll and hit accept . . . might save yourself some hassles