after some playing around I decided a slightly different set of proportions would work better, the smaller 'cute' style was too cluttered and I feel this new taller large style gives me more room to work, I also took the opportunity to accentuate some of the more feminine character traits
I took your advice and reworked the colours a little, however, I am still limited to the 512 colours from the palette in my original post, and can only use a maximum of 15 colours so I tweaked it a bit.
I was using images I found on google of Norse Warriors clad in green cloaks and chain mail armour. of course converting things o robotic metals affects the look, as the leather commonly sen is now a copperish coloured metal plate.
I also reworked a lot of the shading to try and improve the highlights on the metal and give a shiny look as you suggested.

It is definitely an improvement but I think it still needs work
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Edit:
I have played around a little and created an alternate head style something a bit more like a Norse helmet.. however, I'm not sure which I like better
