|Greetings from the critique club!
It looks like those who stopped to comment really liked this. I think the biggest problem for this image, as mentioned by one of the previous commenters is the focus on the bird. I see that you shot at 200 ISO. If you had shot at 400 ISO you could have use a smaller aperture resulting in more depth of field. With any lens, you lose sharpness when you shoot at extremes (Right at the long end of your zoom, wide open or stopped right down). Its better to shoot about stop less than full to get maximum sharpness. You had a good choice in shutter speed though to help counter camera shake.
The image is a little bit underexposed so a minor correction with curves or levels would go a long way.
As for meeting the challenge? This definitely conveys cold while providing an interesting subject. Ideally, it would be nice to take a step or two forward but with small birds such as these, I am often happy to get any sort of picture let alone the ideal one (in terms of composition, framing, background etc.).
Overall, a pretty good shot with a lot of potential I think.