The use of fill flash is good, but the subject itself lets the picture down slightly. The bush / tree is uninteresting and actually distracts from a nice background. I think a few steps back so it didn't fill quite so much of the frame would have helped here.
I can see the use of fill in flash here, but I am not sure it is trully adding to the picture. The lit grass does little for me, nor does the lower half of the tree. The bright white on the horizon also detracts from the overall view