Entry for the weekly challenge, I used mr kenneth fejer's fighter portrait as inspiration (> http://pixeljoint.com/pixelart/8327.htm and all his other lovely work !!!)
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Weekly Challenge: Gems
Massive thanks to Lakelezz for pointing out a stray pixel I had and for sharing this amazing tool so I can learn more about colour optimization:
http://yanrishatum.ru/pj/?input=http%3A%2F%2Fpixeljoint.com%2Fpixelart%2F17123.htm