Most of these posters look like they were shot on the Alcatraz set. Fox was not happy with the first gallery shoot [ the head shots that have been released thus far ] and they brought in a new photographer to shoot these shots during the last few weeks of the show in Dec. They wanted the shots taken on the sets, to help capture the feel of the movie, etc.
The Angel poster looks to be about the only one to be used from the first gallery shoot, as he is wearing the "battle" or "attack" mode wings created for him, and those were only applied to Ben during his "cure" scenes. There does not seem to be to much digital touch up, other than the streaking to make him look like he's flying.
They printed all the Beast poster in red, to help sell the blue fur, but they should have left the red color off of the hair on his head. This hair is closer to the same color as his arms, and the red on it does make it look odd. Also, they left his feet red, without even a hint of blue.