I used a Sony camera to take the photos and used a iPhone 6s or iPhone 7 to use a flashlight. Something that worked very well was lighting up the person while taking the picture because it made the background really dark. Something that was hard to work with was making sure the light didn’t bounce off the wall because then the picture would look bad and be all messed up. Here is an example of what we did:
https://photos.app.goo.gl/AmsKeNhchawZLKjl1