The heavy overcast worked in your favor, as the whites and blacks look quite nice. While everything looks fine, I feel as if the image is just a bit lacking, perhaps try adding something to your perch, some greens, some berries, whatever to put it over the top. And maybe a thinner perch for this wee birdie. (I'm trying to improve my set ups as well in this regard).
Very nice look-back pose, soft light, sharpness and BG. I would run NR on the BG and agree with Grace that a more interesting perch would make this even stronger.
This one is really good. Nice smooth BG and bird very sharp and well exposed. Loved the feather details. Light conditions have helped...u can feel almost feel the softness in the feathers.