thanks Ron, Airy and Peter.
Wonderful shot!
How did you enlarge the background to the right? The blur of the rightmost edge (I suppose that's what you had to add in order to paint the wingtip) looks distinct from the rest of the image (bigger radius and different directionality, as if it came from a shot with bigger aperture). This is only a small detail, but maybe it is something hat can be improved?
Thank you Simone for your comments. It is incredibly valuable to get your sort of feedback. Often, Mongo cannot see the details you pointed out. Now that you have, he has been able to go back and take a 200% look the original saved Tiff file. Thanks to you, he can now see the details you were explaining.
Now, to try and answer your queries:-
yes, the background on the right hand side had to be enlarged before the wingtip could be reconstructed by superimposing onto the background. Mongo can now see that the background (which was sourced from other sections of the image) does not have the same grain and radius under some magnification. This should not have happened. The sourcing of the background should only be done after virtually all the the post pressing (except sharpening ) has been done and always at the same image/pixel size. It is probable, in this case, that Mongo may have mistakenly sourced the background from the original file instead of the worked on image. This would explain this error. As far as the wing tips go, it was just a copy, invert, rotate, rescale and past from the whole wing to the truncated wing. Then, any light, contrast etc adjustments to that added wing tip to suit/match its new location (if required). This whole process can be much improved to be almost undetectable but it is clear that in this case, Mongo made some mistakes.
Mongo appreciates all your helpful comments. It helps improvement greatly when our attention is drawn to details such as these which we may not have otherwise become aware of.