I do understand. You have to create a style and products that will bring you business. The world of art photography is very different. Artist usually do work in their own voice while commercial and portrait photographers have to supply what is in demand. And there are some photographers that work somewhere in the middle.
I think your understanding of portrait photography is pretty limited. Coming up with new and different styles is a constant.
As for the world of art photography and using your own voice, I see very little that is any different than anyone else's.
I couldn't think of anything witty to say so I left this blank.