Lovely. Color harmony, that fantastic facial disc, dilated pupils, exposure. Yes, a bit busy, but the owl is so dominating that it still works well. Look forward to more examples of the 600 TC.
Really striking view. About as good as eye contact can get. Bust surrounding don't bother me since bird pops against them. I'd watch the whites on the lower part of the face as they look to be getting a bit hot. I'd also like a bit more room above the bird if you have it (and assuming its not some hideous horizontal branch).