I had the pleasure of working on Demon's Souls early on through pre-production as the Lead Environment Artist. These were some of the sculpts I made during that time. It was such an awesome game to work on and the team at Bluepoint Games did an amazing job seeing it through! Probably one of the best looking games I've ever played.
In these screenshots you can also see work from
https://www.artstation.com/khouston
https://www.artstation.com/hermosoleonard
https://www.artstation.com/mkahnrose
https://www.artstation.com/jwag2014
https://www.artstation.com/matthewjvia
And special thanks to Mark Skelton for awesome art direction
https://www.artstation.com/artwork/nd5eK