These are very nice photos! Birds tend to be some of the hardest animals to photograph, so you're off to a good start. As mentioned above, there are some minor focusing issues in the first shot, and I would add that the actual bird looks slightly overexposed (at least on my display).
The second photo is the stronger one, IMO... The bird is in a better pose in a better location, and really the only thing that could use improvement on this photo is the exposure. You can brighten in it Photoshop, and that would probably improve it a great deal.