Painted portraiture has the unfortunate reputation of being still, staid, and even stagnant-looking representations of its models. That is not the tradition from which I hail. I have more respect for caricature artists than the mannered and stuffy portraitists of the ages.
The caricaturist understands that it is not the exact replication of features that creates a real likeness of the model. Instead they focus on the model's breath and movement. They know that if they can capture something about the subject's attitude--the way the individual carries themselves--they will have a portrait in the truest sense of the word.
Since I work from photographs, my greatest hurdle in capturing something of the model's natural dynamism is the camera. Almost everyone freezes up in front of a camera.