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Great start. You asked for feedback so the following is my opinion. If you're asking about future shots ...
For 1, 2, and 3 there is too much greenery. Less is more. I understand the holiday theme but I think there is too much and distracting.
For 1 and 2, the thick OOF branch in the front is a bit distracting.
For 3 and 4, the thick perch is out of proportion to the tiny feet of these birds. Perhaps put a different, thinner twig as a perch that is in proportion to the bird.
Finally, I'd try to shoot vertical. Just a thought. You have done well.
If you are asking about post processing, well that I don't know.
This is great feedback. Thanks!
I'm thinking I will tweak the branches a bit so they're more inclined to the back, and maybe shoot a little higher angle to avoid the branch in the front. #4 was just a nearby fallen tree, but I'll try some thinner branches around the feeder.
As for post, I don't do a lot of printing, so any tips on getting the vibrance from the cardinal would be great, if anyone has any experience there.