From the article about SR1 Beta at unseen64 I have found a link to this video by kbring which depicts some more unseen screenshots from the early version of the game. The user also provided a link to an early preview article of SR when it was 20% in its development in May 1998.
Screenshots from the German PlayStation Zone Demo Disc:
Notice the lack of the Dumahim bodies and no snow.
No rain and a different torch holder.
This mural possibly depicting mourning humans was replaced by Melchiah´s painting in the retail version.
The enemy AI seems disabled since they do not notice Raziel nearby.
The symbols stretch on top of the throne.
Soul Reaver preview article:
The screenshots depict an early alpha build with an early Raziel model
