They're all cool pictures in terms of composition and colors and such, but what is the point of them?
Is there any reason you decided to have those flowers extremely sharp with a very out of focus background, other than the fact that it looks cool? What are you trying to say with these pictures?
I'm not trying to bash your pictures, cuz they look great, but if your serious about photography as an art, you should always consider how every aspect of your picture contributes to the 'purpose' of the shot.