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The composition/framing and exposure/colours are very good IMO, and snowflakes add interest to the shots. The pecker is my favourite. Very pleasant shots all around.
A few comments:
* The chickadee might have been misfocused on and/or there was a bit of a motion blur. Those birds should be really shot with much higher shutter speed, like 1/1600 sec or even faster. In addition, a twig interferes with the view of the bird, obviously it would be better if the twig wasn't there. However, that's one of those things....
* Looks like the Distelfink was not focused on right, instead, the camera AF went to a twig in front of it. That is a pretty difficult AF situation, and using FTM focussing might have helped.
Were you using Nikkor 500 f/4 VR lens ? Pod or handheld ?