I got this one in Sandbox Mode. Everything needed can be found on the Silver Strip.
First, grab a couple of masks. There's a goblin mask at the workbench next to the pawnshop, and a Serve-Bot mask near the Yucatan Casino by the bike trailer; it's sitting in some shrubbery.
Make a Heliblade (toy helicopter + machete) at a workbench. Grab a machete from a flowerbed in front of Pub O'Gold. There's a toy helicopter right next to the concert stage adjacent to Pub O'Gold. Combine the two at the workbench behind the concert stage.
Head over to Hot Excitorama (just down from the pub). Go inside and shut the door. Remove the mannequins from the window so the view to the street isn't obstructed.
Pile up some massagers in the middle of the floor.
Open the door, and place the masks on a couple of zombies in front of the store. Go back in the store, and activate the Heliblade (by holding down X) just inside the door.
Run to the back of the store and get ready to take the picture (LT + RB). Make sure the massagers are in the shot. By now, some zombies should have been attracted to the Heliblade; when they start getting beheaded, take the picture by pressing X.
If you did it right, you should get all four elements in the shot:
- Horror (zombies)
- Brutality (zombies getting beheaded)
- Erotica (massagers)
- Outtake (zombies wearing masks)
Another way to get Brutality is to use Dyna-Meat instead of the Heliblade. Toss the Dyna-Meat in front of the store, and take the picture the instant the explosion goes off. To avoid killing the mask-wearing zombies in the blast get a couple of zombies to follow you into the store and then put the masks on them; then, toss the Dyna-Meat outside.
Dyna-Meat (zombie hand + dynamite) can be made at the workbench next to the Atlantica Casino.