If this shot was zoomed in to fill the frame with the bird, it would be just another picture of a bird. Moving the subject more towards the extremes and leaving the frame "empty" adds a dark feel to this image.
The next shot is one of my favorites. It seems to show the hardships of a struggling musician.
More examples of negative space.
Stop filling the frame and try to add a little negative space to your photos. You may like what you end up with.