This is actually a very fine idea. We all know what a cat looks like, so you have instead chosen to show something about the cat. Bojangles casts a jaundiced eye over his domain (Is it Mr Bojangles? Or is it Ms?). The inescapable conclusion is that in this place, The Big Bo rules! If he had a little thought bubble above his head, it would doubtless quote Soiuth Park's Cartman ... "Respect Mah Authoritah!" My only 10.
Oh! I like this...I know that look! Quite a daring composition.I do find myself wanting a bit more contrast, particularly in the lighter areas of the image.
Unique take, but it doesn't scream 'portrait' to me. Black animals are very tough to get detail in - as you can see here. Whole picture seems a bit soft.