What a nice shot! Good clarity on the bird, nice framing overall and the way the bill of the bird works with the leaves on the branch is very interesting!
The color seems a bit flat, almost like there is some back lighting on the bird but not quite there. As a result the gray on the bird comes out really flat looking and the detail on the feathers seems just a tad soft in some areas.
The branches and leaves on the top and side are very well placed for the shot but the one shadow or leaf on the bottom in front of the rock is a bit distracting to me. I know these are little things but honestly that is all I have to work with, little things but all the major things are there already! A wonderful shot overall!
Beautiful nature shot, top marks in an appropriate challenge, I think you'll not do well in this one as the branch connection is really just a bit obscure