This is a cute capture. You did a good job getting the squirrel and feeder in focus. The thing that I see where you could have improved are on the "halo" around the squirrel as some mentioned below. Because of this, it make it quite obvious that the DOF blur was done in post. Also, I think if you would not have blurred the background so much, it would have looked more natural, thus, improving the quality of the photo.
This is agood capture, although a little soft and suffering some lack of appealing colour. Unfortunately, the squirrel appears to have a soft halo where it looks like the b/ground may have been selected for blurring.