well painting large works is easier than doing small ones, same with photoshop they use a tablet which makes it easy, they also use a photograph and paint over is so that you dot see where it came from, it may look good but to what limit?
Yes I know with digital painting but I mean photo restoring with airbrush. It gives you a lot more flexibility to repair the photo. Where cloning and healing tool are limited if an entire arm is missing or something. Faces are really difficult without using an airbrush. Here are mine here [link] It was just a 1 time attempt and I did all in a day or 2. Never did another one since.
Wow, this is lovely. Since you ask for critique, here's some positive feedback: I see the whole top left corner is missing and I love that you left a little to the imagination. However, his right ear is awkward. But well done!
The area to the top left looks awkward when you look at it for more than a second or two from the background blurring/copying you did; with the two side by side you can tell the shadow in the corner is missing and it gives the left side ear the appearance of the top edge missing. But I'm nitpicking on details since you want feedback. It's a superb reconstruction job all things considered, and your patience is to be applauded.