Hi,
Using Recover My Files (
Data Recovery Software to Undelete Files; Disk recovery; Recover Deleted Files) run a Complete File Search. In the drive selection window, search the physical hard drive and in the file type selection window, select the 3 jpeg file types.
This search will find JPEGS by their header and footer - they will not have their original names, but you should be able to preview them in the results screen.