I tend to agree with John that there is too much space on the right. I don't think it would lose anything with less than the entire branch in the frame.
What I find difficult about this shot is that the tree is so strong it overshadows the bird.
By including the entire trunk you make it a center of interest in the photo.
Perhaps by decreasing its color impact and changing its position in the frame, there will be more emphasis on the heron alone.
(this suggestion is based on my observation and belief that the importance of items to the scene, as intuited by the viewer, is affected by their contrast, the amount of space they take up and whether they are split by the margin.)