Entertaining, not perfect.
Nice collection, not sure if they were all really Noir, but still entertaining stories.
To the first animation, a nice twist at the end, your story is good. Your style is very inconsistent though, sketchy and unfinished in some areas, and extremely exact and geometrical in others. It looks to me like you ran out of time and had to rush it out. Maybe refine it and resubmit it on its own later?
To the second animation, not really Noir at all... Very little story, its more of a "hey look at this robot tittie lady kill people." I like your style of art, perhaps work with a writer in the future? Music choice was not appropriate, in my opinion. Perhaps you were trying to be ironic with the choice, but I felt it didn't help your animation at all.
To the third animation, you were my favorite. :) As others mentioned, its not exactly Noir, more a gangster theme. Despite that, it was a well written story with a nice style of art and while the animation was a little limited (shooting tommy guns one handed looked awkward) it got the meaning across. The ending was just about perfect, gotta applaud that.
to the fourth animation, still not quite Noir, but not bad at all. Honestly, change the clothing a bit, trench coats and evening gowns for instance, it would have helped a lot. Very short, which isn't always a bad thing. At the end I assume the gunshot was her, but it wasn't quite clear. Seems a little unlikely that she could have shot with that big gun so close. I'm just nitpicking though.
Overall, an interesting collection, I see a lot of potential! Keep on it.