We found two alternate splash pages so the PDF has been updated!
Below is a link to Bill Sienkiewicz's unpublished artwork for Detective Comics #801. The first issue of what was supposed to be our collaboration of an arc of stories titled
City of Crime. The art for the first issue was completed but never published. We came across a set of low-res photocopies of the pages while going through some boxes. Below is a link to a PDF of the art and a little story about why it's never seen publication (which I first thought was because the art was stolen but it turned out to be for far less nefarious reasons).
Have a look-see. Link below.
David & Maria Lapham