In 1992, I spent an hour a day copying drawings. I found an old book of modern art that was falling apart, so I would tape a page from the book in my diary, then copy it on the next page. I also clipped photos from magazines and copied them. Over sixteen months - January 1992 to the end of April 1993, I did copy drawings every day. I also did many copy sketches that were less detailed. Here are a few examples.
This art exercise has been around for centuries, but is best described in Drawing on the Right Side of the Brain, by Betty Edwards.
I included these images in my 2021 presentation at the 38th Annual Conference of the International Association for the Study of Dreams - IASD presentation slides.