The great photographers of life - like Diane Arbus and Walker Evans and Robert Frank - all must have had some special quality: a personality of nurturing and non-judgment that frees the subjects to reveal their most intimate reality. It really is what makes a great photographer, every bit as much as understanding composition and lighting.
You tend to compose things more in the middle of frame in 3-D than you would in a conventional frame. You can really see composition in 2-D but in 3-D your composition is much more complex. Everything has to be artificially enhanced. But you do gain something else with 3-D: you have a sense of space and heightened reality.