The crop on the first one looks awkward, the subject is to the right and facing right while there is more space on the left. I'd crop the left side in to remove the small branch and add more to the right if possible (maybe use Steve's technique to add some room!) I'd bring up the mid tones in both, birds look a little dark/muddy to me; they could be brighter with a little more pop (contrast). Looks like you could brighten the entire shot as there seems to be a half stop or more left in the snow before it blows out. The second one could use a little more space around the bird, looks a bit cramped to me.