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First of all, you have to be clear what type of portraiture you are interested in.
Wide angle lenses can be very useful if you want to include other elements...surroundings, things that can tell a story about the person. This type of environmental portrait is very cool when done well. It´s seen a lot in photojournalism...and many of these photos have become famous.
But...in general, don´t shoot too close beacuse the face will be distorted, for example resulting in a big nose.
The 50mm is very useful...you can do nearly everything with this, and the wide max aperture is a big advantage...especially when used wide-open to minimize the depth-of-field.
The 80 - 200mm is also very useful. You can achieve tighter crops where the subject´s head & shoulders fill the frame, without the distortion that would be seen in close shots made with wider angle lenses. Your Vivitar has a max aperture of about 4.5, right? Use it like that at 150 - 200mm and you will throw the background nicely out of focus, and in addition the lower optical quality when used wide-open will be an advantage...reducing some blemishes and giving you a softer, creamier effect.
If you are wanting to get the traditional head and shoulders, and raise your standards significantly then I would look for something like an 85mm or 105mm with an aperture around f2...optimal, and it was considered the industry standard. The results should be really beautiful.