I took this close up of a turtle dove from a blind in my backyard on a cold winter afternoon. The dove had puffed up its feathers to keep warm. I liked the texture in the breast so I made a couple images.
1/200s
f/8
ISO 800
+1 EV compensation
Sigma 120-300 f/2.8 with 2x TC @ 600mm
Nikon D70s
He looks like he's wrapped in a down blanket for sure! As mentioned, the bird is too tight in the frame and the composition is awkward. Since the fluffy breast feathers are what you wanted to capture, it would have been better to have more room in front of the bird and less of the body behind the neck and perhaps a bit more room on top.