You certainly have a good one here Dave. I see you needed a really high iso but you have handled the noise well. Since it is perched, you may not need 1/2500 of a second. I suppose the F9 is because of the TC
Re Background - I would try darkening the brighter areas to make the junco more prominent
I love the pose with its connection to the viewer
Re composition, i would shave off some on the left
Dark birds are challenging and you have done a nice job!
Nice pose and I like the perch and background, but something is definitely awry with noise reduction in this one, Dave. The perch and parts of the bird have no texture at all, while other parts of the bird appear quite noisy. Unfortunately, I’m not sure what’s causing it, but I’m almost sure it’s in the noise reduction/sharpening you’re using.