It may be just me, but I'd prefer to see at least the tree crown against the sky... - as it is, the tree is lost in the details of the canyon. Great spot.
Really great picture. My eyes went straight to the tree. I had to really look at the image to realize that the Grand Canyon is the background. Great Job.
I love the composition. I wish you would have done something to bring more attention onto the tree as my eyes naturally want to look at the depths of the canyon instead. 8