recovering erased hard drive with Testdisk
An image copy (what you did with testdisk) is a block-level clone of your drive, not a file copy. it includes the directory, which does not include any of your files.

EaseUS, Data Rescue and similar programs can usually recover files from a formatted drive. Yes, they cost money so get out your credit card. Some have a preview mode that can recover a small number of files per scan, basically to prove it's worth investing in.

EaseUS costs $90, you apparently don't think your data is worth that much. Decent external drives cost about $200, a backup would have eliminated the headache you are going through. And there's more to come, as recovered files typically don't have the original filenames.

Also note that if you are talking about the disk drive in the computer you are currently using, the chances of recovering anything go down every minute you continue to use the computer.