I'd have to disagree on two points - The NMM isnt realistic at all imo. Its realistic if he was painting Sandstone. Not Gold. Particuarly the Shield. As with any surface that can be given a reflective finish, it should be showing something of its surrounds. Unless he's standing in a dentists or something :P
And the heads possition? It would break a space Marines neck? Are we sure :) There's alot fo room in that suit.
The miniature loks great btw
The NMM dolf looks very unusual but it´s more realistic then most other NMM variants, especially on the shield. The helmet doesn´t really seem to fit, it ´s hanging out of the suit in an unphysiological angle - it´d break the guy´s neck.