I was looking around the DC booth when I saw Bullock sketching Superman alongside Darwyn Cooke.
Oh, and they were also doing signings at the Top Cow booth where they had B & W preview comics of the new Witchblade/Darkness animated book available.
Unfortunately, I missed getting a sketch from him at the show, but there's always next year.
I love his Superman covers too. Especially that black & white one w/ Supeman using his red light vision. Great visual.
http://www.dccomics.com/