This is an original sketch by Darwyn Cooke, who died three days ago, from cancer. The artwork is, naturally, spectacular. The crisp, minimal, perfectly judged and weighted lines… unmistakeable.
I have also e-mailed the seller with no response. The listing claims it was made in 2008 at San Diego Comic Con.
I have the feeling that “new” pieces of Darwyn’s art are going to start flooding the market in the same way that those by Michael Turner have done ever since his death.