I really like the look of Jade's figure and waedrobe in this set! Very attractive. One of the easiest ways to get a good, clean background is to shoot against a large expanse of open water, like up on a hillside that's anywhere from 20 to 150 feet above a lake or the ocean. Or in a parking lot that has a large, open,attractive but simple expanse behind it...keeping the background objects pretty far behind the camera-to-subject distance will tend to minimize the depth of field that might cause the background to show up too clearly.
In shots 2,3,4 and 5, you used raw, undiffused sunlight quite well!!! You pointed her fce and eyes right into the sunlight, and at that time of day,m got a good, solid under-chin shadow; the under-chin shadow helps to show the shape of the face, and when the shadow drops straight down toward the upper lip, it looks pretty good. The nose shadow can also go a bit off to one side or the other, and look quite good too. This light was actually not "horriblel", but the exposure and processing of the captures looks like it was not quite 100% optimal.
I dunno..these same basic poses would have been quite good if the backgrounds behind her would have been less cluttery, or more compelling. For the next time, just try to keep it simple: motorcyle, rider, good wardrobe and styling, and some decent light, simple backdrops, and shoot. FIND a good location, before you do the shoot, and make sure that the lighting conditions there match the time of day the shoot is held at.