Well the colortone doesn't really bother me but I think you should keep the highlights and stuff within a spec. shader like you did with the clones.
Theres a few more ESB and ROTJ Helmet views:
He had those stripes in both ESB and RotJ. I just can't tell what color they are. In some pics they look rather bronze while on others they are clearly orange or red.
But Lucas seems to like changing color schemes between the movies. His overall used to be blue and turned to beige, same with the piece of cloth hanging down the Shoulderpad. It was red/brown at first and was changed to green for RotJ.
In the end I think this is the most accurate shot you can get and it shows those two arrows I hope you'll add to your skin: