I agree with Ron - background, while a good colour/lightness for those pictures is a little distracting. Increasing the distance between your subject and the background may be the easiest way to fix this through depth of field.
If it were not for the support #6 would be my favourite, I'd have to say #7 though. In many of the earlier pictures the flowers are too far off to the side of the picture so it doesn't look as balanced as it could.