I don't tend to shoot portraits very often these days. Its something I tend to do when the moment strikes or I have an idea.
I took a a long hard think about whether or not to include these in my portfolio. In the end, I consider them a good example of technical lighting.
I considered moving toward portraits as a specialty, even setting up a studio in my old apartment. I ended up moving towards interiors, commercial and architecture instead. As a "job" I find it suits me and feel it's more rewarding.
I still take the odd portrait when the mood strikes :)