I can find some more problems with the photo, but it is the eye and pose that pleased me. Capturing Black Capped Chicadee eyes can be tough.Chickadees are tough to get right and if the light is off their breast looks soft and it's hard to get feather detail from it. I think this has happened to yours as on my monitor is appears to be slighty soft in that area. It is a nice pose.
OHcorgis, I find nothing wrong with your photo just bringing out the subjects difficulties for a photo. Yes the eye is black and it can be the reason if the eye looks good the breast don’t. I have found taking photos of all small birds the best thing I can do for a good photo is keep my shutter speed as fast as I can as they seen to be always moving even when sitting still. I think for best overall results the SS should be a higher number than the total focal length of the glass your using. Your shot was at I think about 350 of a second with a 500MM lens so any movement will most likely show. Also your ISO of 200 would be a reason for the slower SS. I keep all my cameras (both Nikon and Canon) set on 400ISO and right now the one is on 800 and I have no trouble with noise and my SS are way up there, besides noise can be helped out in PSCS if it’s reasonable as I guess we all know you need something fairly good to start with. Try bumping that ISO up a bit and see if the faster SS helps get all the feathers still.I can find some more problems with the photo, but it is the eye and pose that pleased me. Capturing Black Capped Chicadee eyes can be tough.
I have not had the rapport to get them to eat out of my hands. I am impressed!