Lovely neat Little Owlet, when I first looked did think the bird looked a bit lost in all that space and wondered about cropping but then you would loose some of that great looking BG,I will be interested to see what others with more experience than be say, it ticks all the boxes for me think it's great.
That's one cute Owlet, but I agree with, Keith re the room at the top of the image. If your choice of composition was just for a Web presentation image, then I think there is too much canvas above the Owlet. But, if this image was intended for publication ( as in a Front Cover ) then the extra room at the top gives for some editorial scope, and therefore it works on that basis.