Wow!
I especially liked the video showing how the Abraham Lincoln photograph was done.
My dad died 10 years ago this week. When I was going through some of his papers, I found an envelope containing old photographs including one amazing one of him on bomb disposal duties as a young man in WWII. Unfortunately, the picture had not been looked after. It had faded, been folded in half twice, torn, and had white gloss paint spilt on it. I decided to have a go at restoring it. This was the end result ...
Some parts of the picture were too badly damaged so I just had to paint over them with clones of other parts of the picture. Still ... I was pretty happy with it! (I feel like having a go at colouring it after watching that video, but I would need to use more sophisticated software than what I have used in the past.)