Hi Saikat, Gary, Gary,
it seems we have very similar lines of work!!!
Saikat,
nice to see you back!
Your 'reconstruction' work is outstanding!!!
I did the same as Gary but the other way around ... meaning I copied and pasted the corrected part of the picture on the original .... after that I copied and pasted parts of the original arm on the corrected one trying different blendings and adjusting Opacity, to get back some texture and dimension.
Finally I used the Curves and some light airbrushing to balance and enhance shadows, highlights and midtones.