I think its really good, but maybe you should add an engraving or something. But overall really good.

i think it looks more like a gold plate then a coin but eh nice gold look

 Just fixed it.

 Thank you for the advice. I will cahnge that.

firstly, you have banding

secondly, the banding is an extra color that isn't needed

thirdly, I'd AA the edge of the coin.

Here ya go: i.imgur.com/y14XJ.png

 Thanks for the heads up on the oekaki thing, I can see how that would make  it an issue to get this approved. Thanks for the advice on the color too, I will fix that.

 The colors are good and you've achieved the metallic effect pretty well, but I think the black is too intense within the coin, as reflective as all those surfaces are no part of the coin should be completely unlit. I can foresee this sitting in the queue for a while due to how sketchy it is though, PixelJoint tries to differentiate between 'oekaki' an pixel art, this seems between the two. Some AA around the coin may be good, and adding a color to ease the transition between your lights and darks could help it look more polished.

I really liked the color selection. Nice shiny effect.

 Thanks.

 Those are some tight colors dude.

Ah , I see . Well , I'll go to bed now , realy tired . LONG DAY ! :)

 Sorry about that link, just copy paste. :)

 No problem, for this I used a refrence for color, see link http://www.invest-moneta.ru/_images/China_2005_Panda_12_oz_Gold_BU_Coin.png

 Well , I'm getting you . I will try to use this knowledge . So  , thanks .