Multi-Frame

Many artists choose to use multiple images and then stitch them together to create one larger cohesive piece. Typically black and white images (or images with a similarly cohesive surface) integrate together best. And typically black (or white) borders create a kind of stitching and rhythm to hold it all together. Some artists even make these by hand and will literally stitch the parts together with thread, sewing, tape, etc; the idea is to unify all the elements (not to have a catalog collection of different images). Here are some samples by Robert Flick, the Starn Twins, Tom Young, and David Hockey, plus a quick example I made with some shadow images on-line; this one follows the direction re: 4 unconnected images integrating with cohesive surface and flow. I also made a duotone version just to expand possibilities. 

Portraits

Avedon Portraits

Note: 

-Marilyn Monroe is a great example of authenticity, but not Avedon's typical white background.

-The Windsors are 2 people in the frame, not Avedon's typical 1 person, but they connect with us as a couple with real emotion. 

Environmental Portraits

These examples by Arnold Newman show how important placement of the subject is in the frame. The idea is to integrate your subject into a larger design; your subject should complete the design as one of its main elements. Think about what they are wearing (darks, lights, textures, patterns) and create contrast or association with your background environment. 

And one by Anton Corbijn that create a constellation flow between white shapes.

Frame Within a Frame

Examples from the internet: