LOL! So apparently Terry Pratchett got the idea for Crowley’s sunglasses and his dark look from young Neil Gaiman himself! This post about the two of them literally being Aziraphale and Crowley is just wonderful:
(via: Nerd Girl Nation)
RIP Sir Terry Pratchett, you will always be missed.
Neil also said that Terry told him that he deliberately wore white for that picture because “if anyone questions which of us is the good guy and which is the bad guy, I want the answer to be obvious.”