The lighting is rather strong from the right side, and not properly balanced acorss the whole bust, making it difficult to distinguish the merits of the actual paintwork. From what I can see, it's damn well done! The hair looks a little choppy, and I think you could probably do better in the sculpting department in that regard.
And on the question posed, in Scott's most recent interview on the subject of Blade Runner, he stated that Deckard was a replicant!
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