I see now how you did in fact try to remove the mark in
>>3353801 and you did remove some of it. I still see artifacts and discoloring all over the place, especially in the clouds and the grass, and the background gradient is still discoloring the sky, shifting it to green. I'd say you failed pretty miserably on this one.
This
>>3353813 one you did a lot better on, which is expected since it was the easiest possible example of it superimposed on nearly flat white clouds. You failed to remove the diamond discoloration and I still see remnants of the QR code, in fact I can still pull out small areas of it that match up with the master file.
Both of those has an opacity of 5% on the key layer, which is INCREDIBLY low. So here's a new challenge that I'm absolutely certain no one can possibly defeat, even though my mark still hasn't been truly defeated even in your prior examples. It's more obtrusive than my prior examples, but it still is unobtrusive enough that you can view the high res sample to decide if you want to buy a print of it, without possibly being able to remove it to any extent where the photo is printable.
The gauntlet is cast.