Read Doug Moench's vampire trilogy, ending with Batman: Crimson Mist, a while back and began this sketch card shortly thereafter. Then work came up a few weeks ago, so I hadn't gotten to finishing this until yesterday. Even though it's less emphasized in the third graphic novel, the imagery of the red rain seemed essential to include, here. It was a little tricky, but turned out well.
Purchase this original art for $25 USD, which comes in a plastic protector and includes no additional mailing costs (except for international shipping). Contact me via deviantART note or e-mail if interested.
EDIT: This sketch card has been purchased, so it's no longer available.