Ok guys, i'm back home and i checked for this artist i was talking about.
His name is Michael Chang Ting Yu, he is from Hong Kong, and he is pretty much responsible for the way many things look in DS1, and also worked on DeS, you can see some of his work
here.
Looking at the bigger pictures of the concept art for Bloodborne now, i can't say for sure that it's his work. It doesn't quite fit with his drawing style, but it's a perfect match aesthetically i could say. Remains to be seen.
Also looking at the thread i saw this:
oh my, someone took a closer look of that spider thingy from the beta/demo. I think I'm going to get a couple of those urine eliminators myself...
If i remember right, this is a huge Cthulhu like monster. It's not exactly a spider and that's not its belly. It is standing upside down prowling-like, it does have spider like legs, but they have palms at the end, and i think that's its head with the tentacles hanging. You can see it
here.
I really can't tell if that snowy shot is a game or concept art.
The one with the closeup of the character is in-game, the full-shot of the tower with the small character in front of the gate is concept art.