Pictures 1 & 3 suffer from poor composition as the flower in each is just dead center, and they both suffer from being out of focus,with way too shallow of DOF. Outside of the two ants, they're the same picture. Pic #2 is actually your best composition with the flower being off set to the right.
When doing macro florals, try to use manual focus as auto focus really doesn't do to good of a job figuring out what you want as your point of focus. Pics 1 & 3 seem like you might have been just too close, and the camera couldn't focus on the center of the flowers, while the petals are more in focus, but not quite dead on. You really need to watch your DOF as it's literally inches or less, so you have to decide what you want in focus and what you don't. Use your preview button if you have one, or view the image on your LCD after you've taken it. There are also DOF charts available online.