My first professional project as an environment artist was a remake of the legendary Painkiller. My duty was to create high detailed meshes and low-poly representation of that mash. Create normal map and a colour texture. Model levels of details for that mash,create collision and a lightmap. We used Unreal Engine 3 to create Hell & Damnation. Below you can see examples of my work.
I was not responisble for level art, below screens of levels are here just to show how my assets were used.