Open the Photos app
Tap Library or Albums
Tap Select
Tap the photos you want to delete
Tap the Trash icon
Tap Delete Photo
Open Albums
Scroll to Recently Deleted
Tap Select
Tap Delete All or delete specific photos
Confirm deletion
To delete photos from iCloud, turn off iCloud Photos in Settings if needed before deleting
To delete photos from a Mac or PC sync, remove them from the synced computer and sync again