Marc, Marc, Marc, Great bird, great perch, and a very nice image but it could have been a contest winner... First, as suggested by others, the red SAT needs to be reduced (no matter how rich the light): the red on the neck looks detail-less. Reducing the SAT will bring back the detail.
Next, when doing look back over-the-shoulder portraits with the bird angled well away from you as here, the very first thing that you need to consider is working with additional depth-of-field, i.e., a smaller aperture. Here, however, are your specs:
ISO 100
f/2.8
1/400s
Why ISO 100??? Why f/2.8???
At ISO 400, you could have made the image at 1/200 sec. at f/8 (if my math is correct...)
Lastly, it seems that you reposted to eliminate the shadow (good job BTW) and cropped to a VERT. When you do re-post, please do it in a new pane and leave the ORIG so that latecomers like me can see the differences and not waste time trying to figure out if they are in the Twilight Zone. Thanks, and keep them coming.