Well, it’s not peacock, and it’s not a male either.
It’s green, and it’s an emperor. If it has no chips or cracks it’s worth somewhere around $500. Ebay being upredictable, of course, heaven knows what it will actually sell for! But one has sold for $500 before.
The green emperors have accents that are similar to the peacock color, but you can see a peacock emperor here: http://www.astralcastle.com/images/windst/emperordrpeak.jpg
And a male dragon is here: http://www.astralcastle.com/images/windst/maleep.jpg
Oh, and an emperor dragon is one of the most finicky Windstones to ship. If you don’t have the original box, I suggest wrapping it in bubble wrap, then putting it in packing peanuts in a smallish box, then putting that box in packing peanuts in a larger box. Otherwise there is a good risk of it breaking in trasit. (And even with the original box you’re still going to want to double box it.)