Hi there!
I'm not sure you know this but this site (deviantart.com) is meant for you to display your own artwork in your gallery, and not the artwork of others. This is what this site is used for. Like I said, I'm not entirely sure that you know this, and I'm not trying to make you feel bad or anything, just informing you that when someone clicks on the images in your gallery, they are going to believe that it's yours unless they actually read the comment you made stating all these artworks are not yours. A lot of artists on here don't read those comments so it's likely most (if not all) of the faves you've been getting and also most of the comments you've been getting are all going to the wrong person. I'm not sure what your opinion is about this, but I believe it's immoral to be doing this. These artists put a lot of work into their pieces so for someone to just simply take them and put them into their own deviantart gallery without asking is unfair in my opinion, especially if those artworks are generating faves and comments that should rightfully be going to the owners of these artworks.
The following link is to the actual artist's page of one of the pieces you posted in your gallery:
[link]Now that you know that he, in fact, has an account on this site, and you have the means to message him and ask him if it's ok for you to be posting his work into your own gallery, I suggest that you do so, and in the mean time, take down these works until you have the permission from all these artists to do what you are doing.
Maybe you are not actually an artist, and just a fan, and are just oblivious to the fact that art takes a lot of time and effort to do. I'm aware of the fact that none of my works are in your gallery, and I'm really glad they are not as I wouldn't be too happy about it. But there are other artists works in there and they are not getting the credit for it, despite all the hard work they've been putting into it - and the sad thing is they are innocent. They don't know someone else is posting their stuff.
On a site like this one, you must post your own works, and if you're not going to, you must make sure you have the original artists permission first. It's just the general rule of thumb in the art world, and maybe that's something that you just don't know about.
Anywho I'm not trying to rag on you or anything, I just think you seem to be completely oblivious to how the art world works. There are other really great sites that you could use to share your wallpapers, like pinterest.com for example. There you could create boards of stuff you like and no one will ever say anything to you about sharing it, because that is what the site is for. This site, however, is not for that.