You got the concept right. Now you have to work on getting the center of attention either in the center or to one of the sides. Use Single point rather thatn Servo. Great color!
Rosl: Glad you are experimenting! Try using a filter to even slow the speed down more. And, try zooming the opposite direction. I think this is a good way to photograph not so fresh flowers. Nice fall colors. I look forward to seeing more of your experiments!