The NMM doesn't work all too well. Stronger highlights - all the way to white - are necessary for the iron not to look like stone. Same thing with the gold, and that's why it looks too yellow. But compared to other dreadnaughts that are here, this one is simple, clean and elegant, well, as elegant as a dreadnaught can be.
"IRON WITHIN, IRON WITHOUT!"... hehe... sounds like my iron warriors ^^. about the dread: good clean work, but your colours look a little bit...hmm...flat? especially the grey (or nmm metal). try some multicolour highlights.