I wish we had birds that colour over here. I generally like this image.
One thing I notice is that the eye is not sharp but the breast is. I think this is where you may have focused. I think you could have reduced your shutter speed to increase the depth of field with the bird being perched. Of course I don't know how much the bird was moving.
I would also consider cropping the right of the image to remove the twigs and leaves.
I am only learning myself so please see what others thinks as well.
beautiful bird. Iain already pointed out that the eye and beak are not sharp. I'd check to see where you focused. For a small bird, f6.3 should be OK. The head angle is not ideal as the bird is looking away from you a little bit. If possible, I'd wait for the bird to turn towards you a little bit before pressing the shutter. BG is good, except for a large blotch of dark area. If you take a small step to the left, you could have avoided this black spot. Loi