Portrait photography, if you have the knack for it, is a very satisfying type of photography. I say you have to have a knack for portrait photography simply because it’s true. If you can’t put your subject at ease and get them comfortable sitting in front of a camera then as a portrait photographer you have a problem on your hands.
Your subject will turn out stiff and unwilling and it will come through in the photograph as well, and it won’t matter how good a photographer you are, or how much wizardry you can do with editing software.
If the original photograph you take is flawed then there’s not much you can do about it except go back to the drawing board. And by the drawing board here I don’t mean your portrait photography skills but the need for you to brush up on your people skills. And don’t worry if the first ever portrait photograph you take is of the person looking stiff and unnatural, you just need to keep trying until you get it right. Besides, most first attempts at anything invariably come out looking wrong so don’t get discouraged.
It’s only when things are still looking decidedly dicey after about two years of almost dedicated portrait photography that you might want to think about brushing off those people skills you knew you had but which you haven’t been able to find.