Well, you started with attractive females of a good age cross-section, so that's a plus. ALL of these ladies could be made to look VERY pretty on-film, with a bit of makeup and some decent lighting and some good photography technique applied. A few things. First...the lighting...you are working in low-contrast, "flat", open shaded conditions, which tends to produce a slight blueish color cast, even with AUTO white balance set to ON. I would use "Shade" white balance.
Second...move close to the "edge" of the shade, where the shade meets the light of the open sky. Have the people in the shade, but facing toward the sky's light...that will create catchlights on their eyeball surfaces, and that adds what I call "eye-sparkle". Your subjects currently have dull-looking eyes, with no sparkle.
Third...angle their torso to the camera, so they are not square-shouldered in every pose. On really slender gals, straight on square can be 'okay', but normally, some angle to the body, from 30 to 45 degrees, helps add a bit of implied movement...some angle..some dynamism.
Fourth: STOP shooting everything as a horizontal!!! It crops off the bust, and on very close-up shots, you often have to crop off the top of the head, AND you also leave the head supported by nothing more than a slim stripe of shoulder-tops that run across the horizontal frame. The first defect is called a head chop; a head shown with no "base" of body and shoulders is a floating head. The combination of both a head chop and a floating head is called "awful".
Fifth:Get a BOOK on portraits from your library. Don't go to the web....get a BOOK. Keep at it! You show good potential I think!