Very colorful image. It looks like the focus point is on one of the rear petals. That may be what you intended, and if so ignore me, but I would try for the nearest petal if it were me. I do like the depth of field choice that you made.
You may already know this, but I have moved my AF activation to the AE-L / AF-L button on my D70. I got the idea from Ron Reznick. Basically it allows you to set your focus by pressing the AE-L / AF-L button, and then releasing the button and re-composing the scene. I can't shoot any other way now. You might want to give that a try.