Canon 7D; 150-600 at 600 mm; 1/640 at f7.1 ISO 1600
I like the setting for this shot with the moss on the tree trunk. Also like the slight diagonal of the subject and having more room on the bottom where the bird is facing. There seems to be a fair amount of noise on the bird’s beak and head - may want to give that a second look. Nicely captured.
Nice pose and composition, @Allen_Brooks. The moss/lichen on the tree bark adds a lot to this image. I do find a few tech glitches in the image. As Allen Sparks mentioned, there is a lot of noise in the large version. Also, on the large version the subject appears a little soft - looks like the focus point is on the bark and not on the nuthatch.