Focus is very nice, as are colors and lighting. However I think personally the lack of balance here really detracted from enjoyment of the image. The two large circles being on the left and middle, and the small one on the right, just feels unbalanced. I do understand that you could not really have put the small one in the middle, due to the storyline of the dandelion. Maybe have the large ones on top left and top right, and the third image presented larger, down below the other two?
I do like how each picture seems like the dandelion was presented from the same angle. That goes a long way toward making this seem real. I have seen other entries where it was obvious the three images were of different objects, but it was meant to look like the same object at different times. The fact that yours isn't like that helps me believe that this is a "life cycle" and not just a bunch of flowers.