Not quite the same: lots of (different) fine tuning with subtle and not so subtle color and line changes!
These are variations on a digital foil, each with considerable additional coloring by hand. The foiled image was differently adjusted for brightness, saturation & contrast for printing. Then I put in several hours of further work, taking each of the above images in slightly different directions. This is easier to see in the larger view: just select & move through the “lightbox” slideshow.