The 2011 Newgrounds calendar sure gave us a lot of great entries! What makes this so awesome is how you do each and every character justice. I am very happy to say that I can identify every single character here. From left to right, it's the Tankmen, PIco, Bitey, Hank, Dad 'N Me, Snake, Alien Hominid, and Salad Fingers. Snake is from the "Metal Gear Awesome" series, not just from the games. It seems like you did get characters with matching color schemes for the most part.
Salad Fingers' fingers look like swatzikas. Hank looks kind of weird with a red gun. Dad's head is looking smaller and smaller in every art submission I see him in. They all strike nice poses. You do all of us Newgrounds fans honor by making this.