Very nice. I love the coloring. I especially like how his little fist is up in front of him, such dignity in a squirrel. He could be puss-in-boots of the squirrels. Great bokeh too!
I agree with wkmen. Kinda gives a sense of caution. I think it would look better if it were a little brighter though. I also think you done a good job cropping. I also like the border it works good for this shot. Good job.
This is a very nice shot - has a feel of caution about it - the squirrel in the shadows, observing the observer. You've cropped it just right in my opinion. Focus is excellent. Probably the best squirrel shot I've ever seen.