here's some sketches and the final illustration for the cover of
Batman: Golden Age Omnibus vol. 1
784 pages of vintage Batman by Bill Finger, Gardner Fox, Bob Kane, and Jerry Robinson.
From the publisher's sales blurb:
The stories that catapulted Batman to legendary status are collected here in a single, massive volume. These original stories from DETECTIVE COMICS #27-56 and BATMAN #1-7 include the origin of the Dark Knight, as well as the debuts of Robin, Commissioner Gordon, Professor Hugo Strange, The Joker, Catwoman and more!