Symmetry and Connections in Posing
There is something special when you can get subjects to pose in a nearly identical manner while showing connection between the two parties. It often takes careful working between the two partners as well as a careful eye on the part of the photographer.
One can certainly use a variety of techniques in photo editing programs to achieve a symmetrical or even a complimentary pose using only one model. In the image below, the same model was composited onto the image with a different pose using photoshop.
One YouTube tutorial can be found through the Photo Extremists if you have not performed this type of photo editing in the past. However, this does have some limitations since the model can not actually 'see' his or her cloned image. Another option could be to 'mirror' and image of the same model in photoshop. A variety of photoshop actions are available though many web based sources.
In the desert image of the models above:
Having a pair of models who compliment each other in several ways can bring forth a vast variety of poses and interactions that would be difficult to accomplish simply using cloned or mirrored images. To be honest, photo cloning and mirroring are fairly obvious to detect even by the casual viewer.
To create dynamic images that don't require quite a bit of editing time, a little pre-production and direction by the photographer is also necessary. Clothing that compliment each of your subjects is certainly important as well as designing or finding a natural light source that is fairly even on both subjects. Having the subjects that are comfortable with each other is also a key component to obtaining posing that do not look forced or strained. Subjects with similar physical characteristics also goes toward creating a more unified image.
During the pose itself, it may be necessary for the photographer to fine tune poses. An example may be arm placement or head tilt on one or both of the subjects. At the same time, some poses may be difficult to hold for long periods of time, so the photographer should be ready to make the image at just the right moment. This is almost like choreographing a dance set for a production.
If you get the opportunity, the project can not only create some great images but can also boost confidence for both the models and the photographer in their work!