You need to ask this concept artist:
https://vk.com/artbyfed0t
And 3D Artist:
https://qdhd.tumblr.com
http://s13n1.deviantart.com/gallery/
Also you can add to your team these guys:
1) Modder:
http://www.moddb.com/members/punk0x29a
http://www.moddb.com/mods/overthinked-doom3
2) Mapper:
http://www.moddb.com/members/aphexjh
http://www.moddb.com/mods/hallowed-mod