#1 has the best focus and DOF, but I like #3 in terms of composition and subject.
The DOF in #4 isn't quite correct, it's not focused on the petals which I think is what you were trying to achieve.
Make sure you watch the red focus point flash, to determine what it's focusing on.
If you line up what you want to focus on, and hold the shutter halfway, focus will be locked. You can then compose your shot (move the camera to get the subject in frame how you want it) and then press the shutter the rest of the way.
Nice work
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