If you do a google image search for his name and then go under tool and select size large you can narrow the search to high resolution images. Pretty much every single one is a good candidate for an engrave.
The scale I engraved at for this test was 4.5" x 3" (11 x 7.5 cm), and it took about 25 minutes.
This isn’t the correct topic to get into it, but engrave times can vary a huge amount depending on how you do it. Maybe I’ll get a thread going in beyond the manual.