I recently listened to an interview with Williams on one of the Batman-oriented podcasts. He has a book coming out in September about creating comics art on the computer from start to finish: DC Comics Guide to Digitally Drawing Comics.
But, Williams realized, that approach would leave him with no originals to sell into the collector's market, so he also put a couple of pages aside each issue to do on paper. And he does commissions like this.
Do you see a significant difference in style between it and Williams's typical comic-book pages (i.e., those most likely to have been done all digitally)?