I made some update in the Progress To Hell album... managed to take some more creature screenshots as well.
The hell has actually lot of new assets/textures made. While Mars City levels seem like extension to existing Doom 3 Mars facilities, the Hell parts are more original.
There are some locations which don`t look as good, mainly some bigger open areas have problem with texture scale, unified lighting and contrast. It feels like the level designers handled the small corridors and locations much better. Or maybe this is also limit of the idTech4 engine and how this is adjusted for this game. It was made pretty much for Doom 3 metal shaded interiors, and that`s were it was tested.