DeviantArt is not just art, mind you. Of course, art is the most prevalent on the place. That said, it allows any kind of creativity-related stuff. Photography, literature, animations... Y'can even post hand-made stuffed animals on the place.
As for limits... DeviantArt does not have a storage limit yet, but you can't make any pictures you put on DeviantArt private. If you post something on DeviantArt, it'll be available to everyone who enters the site. If you want to control who sees you pictures by using private options, the only image hosting site left I know is Imgur.
Also, I'll be the one who points out how it's funny how you had a Photobucket account earlier this year when it's just the second of January.