This isn't an exquisite 3D render of Corvo's mask from Dishonored. It's an actual mask, put together by the team at Technically Magic Effects.
Sadly, it's not available to buy—it's a one-off made for a competition—but that only makes it that much more of alluring.
The accuracy is a result of the source material: developers Arkane shared the actual 3D models used for the mask in the game, meaning that, technically, this is no different to Corvo's actual mask.
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Except you can actually touch this one.
Corvo, DISHONORED [Technically Magic Effects, via The Omega Nerd]