I don't think there is anything I can say that someone else didn't say in the comments this is just too over exposed and you lost to many details. It needs some texture as your subject matter is loaded with textures. The pumpkin skin as some texture to it but that rabbit is to far gone. It just looks like a head and a little bit of body here and there, to much of it is blended into the background.
Now that I have said what everyone else has said I do like the concept and your composition is fine its the lighting issues that really hurt you here.
I think that the only problem is that it is a bit too washed out. While it is an interesting effect that the rabbit blends seamlessly into the background, more would be gained if there were more texture and detail in the rabbits white fur.