nice sargent study man! the big dong indeed... the architecture studies are looking good too. it's one of my goals to be able to draft like one those industrial designs guys too. if you like that kinds of architectural concept art, check out Khang Le! http://khangle.squarespace.com/environments/
btw, isn't that atmosphere study from children of men, not district 9? i recognize it since that was one of my favorite shots from that movie.
anyway keep up the good work!