|If you normally delete any file or folder that is on your computer, it goes into your Recycle Bin and can be restored from there unless you empty it. These will include files in your My Documents, My Pictures, My Music, Libraries, and most folders excepting very large files and those deleted while holding down the Shift key.|
If the 'Gallery' you speak of is on a remote internet location like a 'Cloud' type storage, then they MIGHT have a similar recycle or trash folder that you can use to recover files, but you will need to investigate on their site yourself or go to their help pages. It is possible that if you name the site, someone may know.
You have to be a little bit crazy to keep you from going insane.