excellent capture of the little guy. If you have a frame where the tail is just clear of the perch I might prefer that one, but the head/body position are great here.
I'm surprised to see so much frost already, it really adds to the shot. just rain here over the channel.
I love the subject, comp, and frost. Wish the tail wasn't intersected by the branch, and find the blue cast on the frost a bit much. A levels adjusment would likely give the image more punch.