Nice shot! I agree with the other two about using thirds. Some Canon cameras (and smartphones) allow you to make the third lines show up as an overlay on your LCD screen or viewfinder (digital viewfinders), but I’m not sure about Nikon. Having the lines gives a great visual as well as a reminder when framing photos, at least to get a feel for doing it.
It can be helpful to shoot vertically instead of horizontally, since it allows space for the tail without including as much background. However, birds, especially small ones, tend to make quick moves making it difficult to shoot them. Vertical also opens some options for publishing such as magazine covers.
Attached is a bird photo I got some months ago.