I think you handled the harsh light well here, Mike. There are a number of subjects you can photograph in harsh light. You did well getting light under the wings. If this were mine, I would recrop to remove the top horizon line.
What beautiful light, and a great catch of this very active bird! Great detail on the bird, but I see what looks like some over-sharpening artifacts on the head and neck. Conversion to JPEG probably added to them. I'm curious, do you use Canon DPP? I've seen these little crystal-like artifacts with its sharpening. It seems to over-sharpen edges and over-smooth more featureless areas. Still struggling with the best settings. ACR does better for me except at very high ISOs -- 3200 and up.
I agree with Marina about the crop -- the light on the bird is so lovely you don't want any distracting elements.