It's amazing. I kinda envy you that you were able to mix light, colour, backgrount and a rabbit of course in one great composition. For two years I've been trying to take picture like that without succes because of my rabbit fidgety. I only can imagine how much mork you put into this photography.
I like that colours and lightning bends nicely with autumn leaves. Brown colors were very good decision. It's also great how background is blurred leaving only rabbit and leaves sharp. Moreover I think that angle of a shoot is also thought trough.
Every of that aspects made very good portrait of a pet. I'm looking forward to more "portraits" of that fellow.