How to delete photos from iCloud when deleted

Go to recently deleted folder from iPhone , select them click on erase the photos the complete steps are in the article Delete photos on your iPhone or iPad - Apple Support

Delete photos permanently 

1. Open Photos and tap the Albums tab.
2. Tap the Recently Deleted album.
3. In iOS 16, iPadOS 16.1, or later, use Face ID or Touch ID to unlock your Recently Deleted album.
4. Tap Select.
5. Select the photo or video that you want and tap Delete. If you want to delete all the photos and videos in the album, tap Delete All.
6. Tap Delete Photo to confirm.

When you delete a photo from this album, you can't get it back.

Note : photos stay up to 30 days in recently deleted .