It looks like this piece was drawn in 2009, before the other three Batman gargoyle pin-ups. Layout, pencils and inks:
Buster Crabbe #9 - Frank Frazetta ad
3 hours ago
A random collection of material from comic artist Kevin Nowlan. Started with the best of intentions, but like most other efforts, doomed to perish from neglect as soon as the novelty wears off.