analysis - What does the scene during the ending represent?

In the ending of The Shining, the camera slowly zooms into a photo and closes into a person who resembles Jack Nicholson (or is it him?).

What does this scene depict? How does it relate to the movie?

Answer

Per director Stanley Kubrick:

The ballroom photograph at the very end suggests the reincarnation of Jack.

How does it relate to the movie?

It sort of echoes the "You’ve always been the caretaker." line earlier in the film, which suggests something along the lines that his soul is perpetually stuck at/destined to end up at that hotel.