Hey, don't mean to sound rude, but...
What you're doing is art theft. Even putting their names in the title doesn't make it right. You're taking someone's art and reporting it without permission. That's fine on sites like tumblr and Facebook, but on da it's considered theft. I'm not gonna do anything about it except stop in this warning, but, if I were you? I'd take down anything in your gallery that isn't your original work. If not, others will start to notice. You'll get reported and possibly have your account banned.
Again, I don't mean to sound rude or threatening, but I hope you took all that in.