Very cool. Loads of detail in that poster. The second piece of the alien monster thingy is my favorite, cool design, great atmosphere and emotion coming from his pose.
The poster has too much going on for my taste, I'm not sure where to look, everything is very detailed, but I guess that's the purpose of a poster like that too, to give an impression of multiple facets of the game in one piece.
3rd piece: it's very rough, like you said. The character is clear enough, but I had to look at it a while before I noticed how the shape of the building behind him were working. Tiny bit more contrast/light would make it clearer.
Last piece, no crits really, I like it, works for establising the shot and basic architecture, lighting and general feel.
"It's too bad she won't live! But then again, who does?"