2, 4, 6, last...tone down the "Bean" shot by about a 1/2 to 2/3 a stop...bit bright - I do so love the Bean and was in Chicago when they were finishing the last of it. In the last shot, I'd be tempted to crop out the worst of the OOF on the right side train car. Purple color cast is a bit too dominate in all shots but more so in #4 BUT i LIKED THE COMPOSITION ENOUGH TO GET BY THAT MUCH OVER-COLOR.
For those taking a good gander, take them into flickr on black screen...also have a look at some of his other shots, I presume from the same night.