Ironsights aren't closer to the screen in BiA, the field of view is just limited more (same effect), which can indeed make it larger. There's no strict rules on how to represent field of view on a computer screen. There's no concrete borders on your eyesight.
However closeups are not really feasable with 3D ironsights in BF2 due to it lacking advanced field of depth effects. It becomes notoriously pixelized without them if too close. We figured it was worth the sacrifice for having 3D ironsights. The cameras in our 3D ironsights are generally about where you'd position your eye. Also another thing, I like keeping it simple to an extent aswell. Having them too close can make gameplay seem jittery and unsmooth.
Just something I did for laughs - resatured a screen from SPR:
http://www.home.no/kev4000/spr.jpgThis makes the actual movie look like walking dead, haha
I did some quick comparisons and samples of the OD green, I found nothing specifically wrong at first sight. Keep in mind there are several variations to OD green aswell. However, I forbid further discussion on it here, firstly I'm not an artist, secondly wrong topic.