How can I recover my deleted photos from deleted album

When you delete photos from an album and the album is empty, there are three possible reasons, that you cannot see them in "Recently Deleted":

• If you are lucky, the photos have just been removed from the album and not deleted from the library, so they will not be added to Recently Deleted. You may want to check, if the photos are still in the "All Photos" album on the days and months at the correct date. Then put them back from there to the album where you want them.
• If you are running out of cloud storage, deleted photos will not be saved in Recently Deleted at all to help you to clear your cloud storage quickly. Then you have to use the backups you made to recover your photos.
• And the photos will be purged from the Recently Deleted album automatically after 30 days.

To protect yourself against losing photos when the kids get hold of your iPhone, you may want to protect the Recently Deleted album with a password. By default, the Recently Deleted album is locked with your passcode, so only you can empty it. Make sure, Settings > Photos > Use Passcode is still turned on. Delete or hide photos and videos on iPhone - Apple Support

If they are not in the Deleted Photos album then they are gone. If yu emailed them to somebody or sent them as a text message then check your sent communications.