There's a photo backdrop in the corner of the gym. It's a good one. Three people used it, all staff, all in the first ten minutes.
Photo spots fail for boring physical reasons, almost never design ones. The art is usually fine. The floor in front of it isn't, or the height is wrong, or nobody could tell it was meant for photos.
Height is the thing everyone gets wrong
The 4 foot by 30 foot wall backdrops are enormous and they cover a room beautifully. They are also 4 feet tall, and an adult is not 4 feet tall.
Hang one at floor level as a photo backdrop and every picture has a decapitated adult in it, ceiling tile above the head. It's the most common photo spot failure and it's baked into the dimensions.
Two fixes. Hang it high, top edge around 7 feet, so the printed area covers head and shoulders and the gap below hides behind whoever's standing there. Or use a piece built vertical in the first place. The Insta-Mural is 5 feet by 6 feet, a genuine standing-person backdrop for one or two people. The Insta-View scenes run about 3 feet 2 inches by 5 feet 2 inches, roughly a doorway, and work well at eye level for kids and seated shots.
Give people room to back up
A phone needs six to eight feet of clearance to get two people from the knees up. Most photo spots get three, because they went in a corner where nothing else fit.
The corner is exactly wrong. Put the backdrop on a long flat wall with open floor in front, somewhere the traffic already slows down. Near check-in. Near the food line, where people are standing still anyway. Near the exit, because that's when parents remember they wanted a picture.
Tell people it's a photo spot
This sounds obvious and almost nobody does it. A decorated wall is just a decorated wall. Add a sign and a mark on the floor and it's an invitation.
- A floor mark where people should stand, which also solves your backing-up distance in one move
- A sign above it, even a simple one, so it reads as a station and not as decor
- A path leading to it, which is what the bloody footprints runner is actually for (polyester, double-stick tape, and it works better as a directional cue than as a scare)
- One life-size figure standing beside it, angled in, which makes the framing decision for people
- Somewhere to set a drink down, since nobody poses holding a cup
Two spots beat one big one
If you're covering a large venue, split the effort. A big elaborate photo wall in one corner gets a line, and lines kill participation faster than bad decorating does.
Two moderate spots at opposite ends of the room stay busy all night. Each Insta-View scene covers a doorway-sized chunk of wall, so you can build several distinct backdrops out of what would otherwise be one long stretch of the same design.
Vary them, too. If one spot is the zombie graveyard mural, make the other one the crashing witch. People will hit both if they look different. They won't walk across a gym for the same picture twice.
Skip the prop box
Unpopular position: a bin of hats and glasses and signs on sticks is more trouble than it's worth in a big venue. It gets picked over in the first hour, half of it ends up on the floor, and somebody has to babysit it all night. It works at a small party where the same twenty people cycle through. It does not work at an event with four hundred attendees.
Put that effort into the backdrop instead. A good wall, hung at the right height, with room to stand back, gets used all night and asks nothing of anyone.
Check it with your own phone
Stand where a guest will stand and take an actual picture, in the actual lighting, a week out. You'll immediately see the exit sign glowing over the witch's head, or the reflection off the plastic, or that the whole thing is two feet too low. All five minute fixes then. All impossible fixes during the event.
Build your photo walls from Halloween party supplies, or go a friendlier direction with vintage Halloween decorations. Signage for the station is in party banners and signs. New customers get 10% off with code PARTY10.