EXP and Sharpness look fine. You could have stopped down a little further as you had plenty of shutter speed. I would prefer a horizontal composition with a bit more room behind the bird and infront of the bird. Too much perch at the bottom that does not add anything. With a horizontal crop you would loose that (if you have some room left in the original file).
Cool looking perch Jonathan, and you have captured excellent sharpness on the sparrow. Lovely complimentary colours to the BG. Comp wise, I would just add a bit to the right.
A nice image of this species Jonathan. Nice head turn and eye contact with good detail. I like the perch but would consider a crop from the bottom as suggested.