Reconstruct from the neighbours and the encoding, then re-stage the image more vividly so it holds next time.

A blank locus means the image was too weak (bland, static, non-interacting). Recover it by: using the surrounding loci and the logic of the material to reason out what should be there, confirming it, then re-placing a bolder, interacting image at that spot. The empty locus is feedback — it's telling you exactly which image to strengthen.

Yes — imagining the scene from your own point of view, or with you acting in it, makes it more vivid and memorable.

Seeing yourself inside the image — you kicking the giant rake on your doormat, the moon squashing you into the sofa — recruits more of your memory (movement, body, emotion) than watching a scene from outside. First-person, interactive, slightly personal images are stickier than detached little dioramas viewed from across the room.