Let’s take a moment to discuss the crime wall please?
Sherlock’s wall is usually in place to help him organize his thoughts, and is normally full of miscellaneous pieces of information - newspaper articles, maps, etc. The only time we see the wall full of photographs like this is in TEH when he is organizing multiple members of the criminal underworld. Never more than one head shot per person.
Why then, are there so many repeated pictures of Culverton Smith? What possible additive information could he gain from having the same man’s face plastered up there over and over? Sherlock is fixating on him, and not in an organized fashion. His mind palace is not in good working order, and I would bet anything the Culverton Smith case is kicking his ass.
Not like you needed a mini meta to deduce that one, but there you go.