These aren't bad at all, but there are several areas where significant improvements could be made. As Robin said, one is posing. She is an attractive girl, but fuller-figured and this should be kept in mind when posing. #5 is a perfect example; you've got her nearly square to the camera emphasizing her size, while he's almost 90 degrees, making him appear much slimmer. This pose should have been reversed, using him to "block" some of her and giving them more equal weight in the image. The same is true in #7 where you've shot low and wide; this will appear to add weight to anyone. As well, when shooting from this angle, have the couple drop their heads just a bit so we're not looking up their noses. That is NEVER attractive.
The issue that stands out most for me however is lighting. Every one of these images would have benefitted from supplemental lighting. Even just a simple reflector would have helped, but if you look at images such as 2, 3 and 5 you have blown highlights and utterly featureless skies. A fill-flash or two would have allowed you to knock down the ambient, reduce the highlights and get a much more pleasing overall exposure.
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