More tips for Portraits, always focus on the eyes. Especially if you are going with some low aperture settings or telephoto. The eyes are the first thing most people look at when checking out their photo, it will determine a focused or un-focused subject.
Also, carefully choose the right lenses. Wide lenses are great for cars, but not for people. It tends to make people look bloated or chubbier than they really are. But vice versa, super telephoto lenses can squeeze their face or buddy funny as well.