I made a prison and Karsuman and I think it looks decent+.
It's a prison and you have to escape but it's made to be "escapable" so there are lots of dead bodies because they got trappedified in the butt. What better way to deal with Crafty McRogue types that just break out? Kill 'em dead!
Although, I don't know what you're trying to go for atmosphere wise, but the cell you can see is on the large side. Making it smaller would give a nasty cramped feel for the prisoners.