Your best bet would be PM'ing or emailing the artist who did that and ask him, as anyone else would just be guessing at the colors used.
From what I can tell though, these colors are NOT straight from the bottle! There's been a LOT of usage of a wet pallet to mix them and a lot of wet blending on the fig to get those highlights correct.
There's a preponderance of cool tones used on this model, so if you were to use it as a basis for an army, you'd need to think in terms of what colors compliment it.
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