I get the idea that these images are important or very important to you. If that is the case:-
1.
Stop fiddling.
2.
Get professional level data recovery help from people who do it every day.
They will image the drive and may for example be able to recover previously deleted versions of the files.
I think that you can get that sort of service for £100 or so.
I have never used them but I liked the look of this mob's website
Data Recovery Specialists UK, Data Recovery Lab - Our Recovery Team. They offer a file repair service but I doubt that they can fix jpegs but I am not sure.
####################
Some further comments. I DO NOT RECOMMEND TRYING TO DO IT YOURSELF if the files are of value.
You cannot do this on a live system disk, you need to put the disk in another computer, perhaps in a USB caddy thingy.
I damaged a hard disk a while back by moving it when it was operating (by accident) and considered getting professional help. I instead fixed it myself. I was very fortunate that the damage was confined to the root directory and all files were in easily findable (by the recovery software) subdirectories. I got 100% recovery with an investment in £15 of software and some hours/days of head scratching and general panic. I have been doing data recovery for decades on a very occasional basis but have forgotten nearly everything I ever knew and file systems have become ever more complex.
In this case I knew the cause of the problem (stupidity:-) and was confident that by examining the disk I was not damaging it further. This is not the position in your circumstances.
This is the software I bought a 30 day license for
Data Recovery Software and Forensic disk tools from CnW Recovery
#################
List of PC tools I saved sometime recently - no idea if they are any good:-
http://pcsupport.about.com/od/filere...y-programs.htm