If you have removed the my pictures folder from the libraries then you have not deleted anything - libraries are just a directory system to bring together folders from different drives or other locations.
Check your user folder (top entry in right hand of start menu), and you should still have a my pictures folder, which should still contain your sub-folders and pictures. Library - Include a Folder
If you wish to add this back to the library right click the folder choose add to library and select the pictures library when prompted.
If you have deleted the whole my pictures folder and its contents this is more of a problem but even then there are options than may work.
Check the first option above and post back - if we need to go further we can do this