Just a couple of thoughts...
First - you should make sure you post your exif data along with your photo, else windrider will post a message asking you to do that.
Other than that - I did get a look at your exif data from you Flickr stream, and I looked at the largest version of the photo you have available there. The effect you are trying to achieve may be difficult under your particular lighting conditions and with the lens you are using. It looks to me like you can still open up your lens a bit which may help with the effect you are trying to get. However, your ISO is set pretty high, which is understandable for the lighting conditions and aperture size. So what it looks like to me is that rather than smoothly unfocused areas toward the front of the big guy, you are getting high ISO noise.
I think a tighter crop on all sides to get rid of some of the background and other distractions works, but you'll lose some of the big guys foot, which isn't quite all there anyway. I don't think the crop would cause one to lose the sense of warmth and relaxation as part of the window will still be visible. I am getting a sense that the window is competing with the rest of the photo though, and I find my eye strongly drawn to it. That works fine for the big guy, but is taking away from the little guy, which I think is an important part of the composition. I'm not sure off the top of my head how to deal with that. Let's hope that someone else comes along with more thoughts to offer.
btw - don't forget to post your exif data!