In May 2019, I was assigned (way in advance!) the BTGA Vol 7 cover, an absolute dream gig- I love Jerry Robinson and Dick Sprang both SO much that the hardest part was deciding which story to cover- but Sprang's bonkers "The Year 3,000" from Batman 26 ended up being the undeniable choice. The story features (spoilers!) a descendant of Batman fighting EVIL ROBOTS IN SPACE.
Alas, months after I turned the job in, the Age books shifted to vintage cover images, and this won't be used. But the work got done, and here's some process. Initial sketches were done in Procreate for iPad, final art on 13 x 19" Strathmore 500 w/ brush, nib and markers, scanned and colored in Photoshop.