Yeah, you "got" this cute bird, and this interesting tree, and the sky is OK too, but next time try to avoid two of these objects (the bird and the tree) to be relatively equally focused (branches behind and in front of the bird should be blurred stronger than on these photos). How to do that? First: try to get closer to the scene, second: use wider aperture if applicable with the given (zoom) lens and it's actual focal length (smaller number, say, 4.5 at 100mm and 5.6 at 300mm instead of 6.3 like you did here), third: change the angle (wherever and whenever it's possible, thus avoiding one object to "get in the way" of the other's).
I realize this is not so easy to achieve in many situations, so regard these advices as "theoretical" ones...
On another note: these photos are "squared" (600x600 pix), which leads me to the conclusion that something went wrong while preparing them for posting (when you resized them).