nice sharp image. i wish for better lower angle and to my personal choice i would not like that harsh shadow.
if u could have gone lower angled you may have got the best clean bg and reduced that shadow too.
I agree with Mital's critique. Although not much could be done for a lower angle from inside the car, all it takes sometimes is a pishing or squeaking noise from your mouth to get the bird to look your way for a better HA. Good colours, and I like the surroundings...very nice.
Better head angle would have made this a great shot. This can be easily done by making the bird turn its head, as Daniel has described above. I am not sure whether you had any time for that.