I think there were enough Octavia scares in the movie, pretty much every major jump scare besides Genie was Octavia (the first time Maggie goes upstairs and when Maggie finds Ben's corpse
I was thinking that last bit with the couch pictures could've been alot like the Jigsaw ending of 2017, with actors on a "chain" leaping out from the tableau. That was literally my first thought when I saw Hayley wake up in the film.
Actually, if they wanna do the living poster thing, they could make the couch the opening scene, with some living actors on the couch. Base it off of this poster:
Ma Movie Poster (#2 of 2) - IMP Awards
Besides that, they could start with a small black hallway with "September" playing, and then a truck scare to kick off the section. Then, into a short facade section
a la Ash vs Evil Dead, with all the cars and trucks for Octavia Spencer actors to hide amongst, and the cop corpse on the doorsteps.
Into a short foyer with a staircase and Ma in a newsboy cap and hoop earrings hiding in the bathroom, and into a short hallway that leads to the cage staircase with Genie in the mask as a scare. Into the Luke Evans dog-blood room (brrrrr) with Octavia with the knife, and into the burning basement for the finale with a hanging Maggie as a distraction and Octavia hanging around the corner with a clothes iron.