Nice set, Christina. You were shooting long enough glass that the angle isn't bad at all for shooting a bird perched above you. In nos.3 and 4 it isn't evident at all that the bird is elevated.
In the way of critique:
1. This one IMO is the best pose of the lot. A slight crop off the left side might be beneficial.
2. Something is a bit different with the processing on this one. It almost looks like it is a bit hazy. WB, saturation, and contrast look better in on no.1 IMO.
3. Best techs on the bird itself. Crazy detail.
4. Technically well executed. No eyes and nothing really distinctive in the behavior. Preening, shaking, etc, can be interesting but really need something unique about the shot to be so.
No whining about the snow. Put you boots on and get back out there (this from someone who doesn't shoot in the winter)