I'm saying some scanners, and printers, sure do produce a nice picture. But I don't have one.
Paste, white glue, work well enough. But thin rubber cement will soak through less. Burnish nice. A excess cleans with a cleaning by rubbing.
Modern paper comes in very high quality, that would be hard to be mistaken for an original. Provided it was changed some, for personal use, and not tied to any sales, or distribution. I'd say as ethical as image grabs for comments.
But I'm not a lawyer.