well yes it would tend to look banded wouldnt it?
being as how the one i edited wasnt the big one that TPoe is working on but one of the small ones that he posted in the first post, but blown up so u can see it. (as i said in the post)
it was an example of "how to: shiny metal" not to draw that armour at such a small scale.
anyway, TPoe i actually liked your detail on the initial one. but i thought it just needed a bit of extra "zap" in the shiny department. also u need consider exactly what u are doing this for. if u want to do "real" look then u will as said have to consider how the armour was attached. however if u are going for a highly stylised look then u may take liberties with such details as long as the joints look as tho they could actually move u will be fine.
the one i edited was done in a VERY limited c64 palette, black, white, 3 greys, brown and orange. obviously the higher res u work on may need more "tween" shades of grey to avoid banding at viewing res. also remember that shiny metal has no "colour", it simply reflects the colour of the light hitting it, so grey, blue green hues are all possible just keep them subtle for the "real" look. my personal choice would be to create neutral greys then edge the blue slider up a couple of notches on each of them for a "steel blue" look.
EDIT:
I have taken the version of yours with the detail and added a bit of extra "shininess" to it. i have used "dither" to get an extra bit of tonal range rather than adding colours. you of course can add colour if u wish

i just didnt know how strict a palete u were using.
the bits i edited were obviously, the torso and head. i began the shoulder as a "work in progress" and left the arms so u can see the difference the addition of a bit of black makes.

regards,
Steve