We are not Apple; folks who read these posts are just users like you. We certainly cannot run a "full iCloud Photo Library recovery check," and Apple engineers don’t read the stuff, here. Frankly, Apple expects you to rely on your backups that you keep on an external drive. And for our security they can't go rummaging around in users' personal files.
Were these pictures taken on your phone, or were they transferred to the phone? Some pictures transferred from a computer can be viewed in Photos but they can't be modified by Photos, so there may be some operations that produce a warning about those being at risk. So if you’re missing pictures that were transferred from a computer, then you should look on the computer for the originals.
You can see this:
https://support.apple.com/en-us/118558
Basically the above says to look in Recently Deleted and in Hidden. Be sure to check your Library thoroughly-- the pictures may not be where you expect, as dates may have changed. You can use the search field with the date or location. And remember, you can sort the Library by date captured or by date added. Also, your Library view now has filters, and you may not have your filter set to "All Items.”
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. You should look here:
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support
“Restore” is what you do when you buy a new phone, so this safety, if you have it set, requires you to erase everything on your phone and replace it with the backup.
Unfortunately, if you don't keep your own backups to an external drive, then there really isn't any place else to look. For the future, you can backup pictures to a computer or just save them to an external drive. You can see this:
Transfer photos and videos from your iPhone or iPad to your Mac or PC
