Great background colors in the first one, I really like it a lot.
The second one is a bit dark, but the sky looks good. The focal point doesn't really come at you though -- you may want to bring the DOF so that the flowers in the foreground are in focus as well? I dunno.
I love the third one, that rose really POPS out at you.
Maybe for 2 and 3, crop them so the composition is a little more interesting? I've been told that having the subject in the middle isn't good, and to follow the rule of thirds. But maybe you're more advanced and broke the rule on purpose? I'm a noob, I don't have the eye for this kind of thing.
Great job. I'm just a noob so take my comments with a grain of salt. I really liked the shots! Take care.