This is an immature bird but a little confused. It has the eye color of a 1st immature and the plain gray beak of a juvenile, on top of which it has a brown tone, a regional variation on the normally black, white and gray.
R5 EF 600 f4 III HH
1/1250 f6.3 iso800
DPP4 PS2022 near FF, curves (neutral picked on gray bill), NR to BG, sharpen.
Love the detail here. The breast feathers are beautiful. I think this has to be one of your sharpest shots. Excellent job on the exposure as well. Lots of detail on the white hindneck. I might crop a bit off the bottom, about where the breast feathers start to fall out of focus.