My comments would be try not to have your subject dead centre. Think of the frame in thirds and try to line up your focal point with one of the third lines.
Also it looks a little underexposed.
Taken on board, thanks. My mistake was probably lining up the centre focus point on the dandelion, therefore getting the flower in the centre of the frame.
I would crop it to one side so the yellow part is off to the left of frame.
Exposure was at 800 ISO, would 400 have been better?
Cheers
Hugh