pictures not found

You can see this:

If you're missing photos or videos in the Photos app - Apple Support

Basically the above says to look in Recently Deleted and in Hidden. Check your Library thoroughly-- the pictures may not be where you expect. You can use the search field with the date or location.

If you use iCloud Photos, then you can look in iCloud.com.

If you don't use iCloud Photos, but you have Settings>Apple ID>iCloud Backup turned on, then you may be able to recover data from the last 30 days or so at iCloud.com. You should look here:

View and manage iCloud device backups - Apple Support

If you don't keep your own backups, there really isn't any place else to look.