If you wish to improve your portrait skills then practice, practice, practice. Using the loosey goosey method shown in this video will get you moving in the right direction. There are many formulas available for making faces and when I was first doing them 10 years ago, I used lines and thirds and suchlike to create my faces. THEY ALL LOOKED ALIKE.
People do not look alike. If you study them carefully, faces do not look alike. Let's forget Vogue models and the Beautiful People...real people each have a unique look.