Immediately after getting the gadgets:
--At the end of the hallway in Harbor Cottage
--Mirror in bathroom of Harbor Cottage (First Time)
--Bathtub in Harbor Cottage (First Time)
--Armchair in Harbor Cottage (First Time)
--Beam in Ceiling of Harbor Cottage (First Time)
--At the gate in the cave near the fens

Inside the Beach Caves:
--Tidal Chamber
--Campfire in Smugglers' Cave

On the Train Tracks:
--The "stuck" signal

Northfield Church:
--Motion Detection Shot from entryway table

Night 2:
--Mirror in bathroom of Harbor Cottage (Second Time)
--Armchair in Harbor Cottage (Second Time)
--Beam in Ceiling of Harbor Cottage (Second Time)
--Train Station photograph

Museum (Night Visit):
--Bathroom mirror
--Noose
--Skeleton

Right before bed:
--Set out the camera on the windowsill. Camera will operate overnight

Day 3:
--Stalker photos (receive automatically)

Night 3, Right before bed (second time):
--Set out the camera on the windowsill. Camera will operate overnight

Day 4:
--Walled up dock arch in Harbor Cottage [Trivia: In the original version of the game, this photo was a different image entirely, and was actually impossible to take!]
--Sketch in Harbor Cottage safe

Ulcombe Church:
--Gramophone (After Nancy leaves, after you wind it)

Night 4:
--Bathtub in Harbor Cottage