Dimond cameo –
Dimond cameo is the idea of multiple headshots of people but the difference between them would be the angles that the photographs are being taken at. They give a variety of outlooks on the photo and person been photographed. One photographer who used this technique is Townsend Duryea.
Photo montage –
The Photo montage technique is where the original photo may be overlapped or edited together by another photo , which causes contrast from each photo in the montage.
Double/multi exposures –
This technique is an illusion created by layering multiple different photos and using a blurring or contrast tool to almost morph them to each other and give the illusion of contrast.