What a cute bird! Terrific details and good job on the exposure. The lcomposition is a bit tight to my taste. I think that a bit more room at the right and bottom would place the bird in the upper left corner following the rule of thirds.
I agree with the comments by Juan and Axel, but have to say this one makes me laugh. On first glance I thought he was sticking out of a hole like a feathery plug.
What a fluffed up little guy!! I love it :). I do wish the black shadow on the trunk was less prominent, and find the HA could be a little better. Thanks for sharing this cutie!!